Simulation and Analysis of the carbonat.docx

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1、 SimulationandAnalysisofthecarbonateTAHEoilfieldAbstract: Tahe oilfield is located in Shaya uplift in the northern Tarim Basin in southern Akekule uplift, in Ordovician carbonate karst reservoir.Oilfield, is Chinas first Paleozoic marine oil reserves of more than one billion tons. In this paper, the

2、 characteristics of petroleum geology in Tahe oilfield are summarized from the aspects of tectonic evolution, sedimentary characteristics, reservoir characteristics and hydrocarbon accumulation models. Keywords: Tahe oilfield; petroleum geology; formation conditionsIntroductionTahe oilfield is locat

3、ed in the southern slope of the northern uplift of the Tarim basin area of Akekule uplift (also known as Lunnan uplift) of southern, river named Yinyitalimu. According to each part of it before and after the high yield oil and gas flow and sorting, is now Tahe 1 - 6, won the reserves of different le

4、vel. Tahe oil layer of Triassic and Carboniferous and Ordovician, later as the main body, the Ordovician carbonate reservoirs in Tahe 3, 4, 5, 6 has been confirmed the basic regional distribution. The Akekule uplift began developing large-scale South dipping nose shaped uplift from early Paleozoic,

5、North East axis. Many strata of the Palaeozoic strata became thinner or pointed to the top of the uplift. In most areas, Ordovician and Carboniferous in unconformity. The new generation due to the strong subsidence in Kuche Piedmont depression, resulting in the Ake Culler area and the surrounding ar

6、ea north dipping together. From the lower top surface or the top surface of the Ordovician, formed north west steep dome, so they have Akekule dome called the 5700m isobath, area of about 2450km2, the maximum amplitude of dome about 650m. The existence of the large paleo uplift in the three sides of

7、 the hydrocarbon generating depression has laid the foundation for oil and gas accumulation. To the end of 1999, Ming Tahe oilfield has oil and gas geological reserves of 1.1 * 108t, Ordovician oil and gas proven reserves accounted for the current proven reserves of 89 1%. Tahe oilfield has become a

8、 large oil field in Tarim Basin first proven geological reserves of more than 1 * 108t, large oil is China first marine source reservoir, which caused the domestic oil industry attention. ContentsAbstractIntroduction1 Geological Survey of Tahe Oilfield1.1 Regional tectonic background1.2 The characte

9、ristics of sedimentary 2 Tahe petroleum geology Oilfield2.1 Hydrocarbon source rocks2.2 Reservoir2.3 Reservoir cap combination2.4 Trap2.5 Oil and gas migration and drainage system2.6 Accumulation stage division and accumulation mechanism of2.6.1 Accumulation stage division2.6.2 Accumulation mechanis

10、m3 Oil field formation conditions3.1 Three face markets, abundant supply of oil and gas3.2 Cavern is composed of good reservoir space network3.3 Cover layer, the layers of good sealing condition3.4 High block lower Ordovician paleo Qianshan good trap3.5 Fault and the reservoir is oil and gas migrati

11、on channel3.6 Late reformation destruction of light, good preservation conditions4 The biggest difference between Tahe oil field and other oil fields - beaded structure4.1 The universality of beaded structure in Tahe area4.2 Forward modeling analysis5 Tahe oilfield development status and Prospects5.

12、1 Tahe oilfield independent innovation ability to enhance efficiency of Oilfield5.2 Sinopec Northwest Oilfield successfully solve the problem of deep heavy oil exploitation5.3 The development of Tahe OilfieldReference1 Geological Survey of Tahe Oilfield1.1 Regional tectonic background The Akekule up

13、lift is located in the middle south of Shaya uplift in Tarim Basin of Xinjiang, west of Halahatang depression, east of Caohu depression, South depression with Garr, is a large ancient uplift long developed to Cambrian Ordovician as the main body. The Paleozoic, separated by large faults were the top

14、, from the north to the South can be divided into: akedun tectonic belt, a Kekumu fracture zone and slope zone, central zone and southern Akekule fault slope area. The Akekule uplift in Caledonian - formed late crinkled, Early Hercynian regional compressional uplift formed southwest plunging North E

15、ast trending large nose, in the long term exposure to uplift weathering and denudation process, will generally lack in most areas of the Devonian and left - uplift in the upper Ordovician, they only a skirt shaped distribution in convex pericline area, the lower Ordovician also suffered varying degr

16、ees of erosion. The North East to the axis of the structure is located at No. 1 tectonic of Tarim Tarim Township No. 4 tectonic belt and North pasture monadnock No. 2 East AIXIEKE monadnock Ake Kumu Horst - West akedun large monadnock zone. In the southeast of China, it is a gentle slope, and the no

17、rth of the west side is steep, and a series of faults and faults along the fold belts are developed in the wide and gentle slope. In the late Hercynian movement, the uplift was uplifted and eroded again, and a series of near EW trending folds and fault blocks were formed. In most areas, only Carboni

18、ferous The Ordovician carbonate rocks are exposed in the lower part of the upper Permian and Permian, and the regional unconformity surface formed at the early stage of the Hercynian formation is further southward, and this appearance lasts till the Indo Yanshan period. Himalaya, Kuche foreland basi

19、n subsidence center migration to the center of the Tarim Basin, which lead to more Akekule uplift Carboniferous strata in the South than in the north of the northern monocline pattern of Ordovician Cambrian system for complex anticline form, it is because of the long-term structural feature of the m

20、ultiple tectonic deformation caused by the superposition of the Akekule uplift. The newborn from the Paleozoic and in northern sector shows macroscopic leans to the north, in south central area of Lower Paleozoic in spite of the multi-phase reconstruction has preserved tectonic pattern of the north

21、south high low, especially the ancient southern tectonic axis formed Early Hercynian inclination is more obvious, is pointing to the area of Cambrian Ordovician source rocks in different evolution stage the southeastern depression with Garr and the transition slope of the oil and gas migration and a

22、ccumulation of long-term favorable areas; Upper Paleozoic and Mesozoic basic has been changed into macro North dipping characteristics. The Akekule paleo stress field evolution of the Early Hercynian show that the principal compressive stress is NW to SE, forming a South dipping West NE SW to the ak

23、kol large nose, late Hercynian regional principal stress is N - S to squeeze in large structural nose on the formation of superimposed thrust faults and folds into a series of local E W, such as Ake Kumu, akkol nearly east-west fault tectonic belt; fault horizons mainly to disappear in the Ordovicia

24、n, Carboniferous, only a few large faults extending to the mesozoic. Thus, the Ordovician carbonate rocks in Qianshan Hercynian after basically in a stable state of deformation and burial, play a principal role in tectonic characteristics of Ordovician in Akekule uplift in the southern region of the

25、 late Hercynian movement, early. The principal compressive stress of Indo Yanshan period is NE - SW direction, sustained stable extrusion, the formation of NEE to the right and transtensional fault combination Yanbian three of Triassic and Jurassic in the Carboniferous salt body and lead to large-sc

26、ale plastic flow under the southeast area, the formation of Triassic and Jurassic in Yanbian three low amplitude structural belt. The late Himalaya movement, tectonic pattern of the final shape of Carboniferous strata above the regional South dipping into southeast northwest, determines the period t

27、o become the area of oil and gas distribution, re adjustment, into an important period of tibet.1.2 The characteristics of sedimentary According to the outcrop data and drilling results, in the work area is mainly pre Sinian fold basement shallow metamorphic, the development of Sinian Quaternary dep

28、osits, the lack of the Silurian, Devonian, Carboniferous and middle upper Jurassic, some areas lack of upper and Middle Ordovician, the absence of Permian, the oldest the strata drilled into the lower ordovician. The strata in the area where the drilling is revealed from old to new are outlined belo

29、w . Among them, the southwest area of some wells drilled in the bottom of volcano rock and Carboniferous Donghe clastic rock in drilling, according to the latest research results, should belong to early Permian and late Devonian, because of its limited distribution, this paper temporarilly were inco

30、rporated into the Cara Kalashayi group and Bachu group description. Lower Ordovician: distributed in this area, is South North West and thick thin, thin wedge. The lithology in the upper part to micrite and microcrystalline limestone, sand clastic limestone, belongs to the open sea carbonate phase,

31、lower dolomite is restricted platform facies. The total thickness of 550 1120m above. Most of the regions suffered varying degrees of erosion at the top. In Upper Ordovician: only distributed in the southeast area, drilling area near reveal the maximum thickness of 500m can be divided into two group

32、s, the upper part of the Lianglitage Formation of dark gray, green gray and light brown micrite micrite interbedded, the top is light grey, the variegated mudstone, marl yellow gray, gray, gray, gray brown red light grey mudstone and silty mudstone. The lower part of qiaerbake group for the purple a

33、rgillaceous limestone and marl with nodular dark brown calcareous mudstone, rich in biological, two groups are deep and shallow shelf facies. Carboniferous zone of Lower Carboniferous all have distribution, lack of Upper Carboniferous in, thickness 160 620m. The bottom-up divided into Bachu group an

34、d Cara Kalashayi group. In the lower part of the Bachu formation, the sandstone and mudstone are in the estuary of the Gulf, the upper part of which is composed of the mudstone of the tidal flat mudstone and the thin sandstone, and the transition to the south is a thick gypsum salt rock in the lagoo

35、n facies, and the top of the Shuangfeng limestone is a regional marker. The upper Cara Kalashayi formation in tidal flat and fluvial delta facies thin interbeds of sandstone and mudstone, the lower tidal flat facies mudstone, marl, limestone area, the southwest side of the top preserved volcano faci

36、es dacite, basalt and tuff. Three fold - Jurassic: development and Triassic Lower Jurassic area, lack of middle and upper jurassic. The Triassic are mainly sand and mudstone, consisting of several sets from coarse to fine is thick cycles, 340 555m, with the trend to the south, thickening from the we

37、st to the East and from the north, braided delta facies and lacustrine sedimentary phase interaction. The lower Jurassic is mainly fluvial, swamp facies sand, mudstone interbedded with thin coal seam, the thickness is generally only a dozen meters to tens of meters. Cretaceous third lower Cretaceous

38、 (Karp Liang sand group): the area of the lower Pleistocene lithology to shore shallow lake facies massive sandstone and pebbled sandstone, thick 40 50m; in the upper part, shallow lake facies brown mudstone, silty mudstone siltstone, thick 200 400m. The upper Cretaceous lower three system is mainly

39、 composed of braided delta facies light gray siltstone, fine medium sandstone and shore shallow lacustrine brown mudstone, silty mudstone and so on. Third for terrestrial clastic rocks with huge thickness reached 2500 5000m, from southeast to northwest thickening.2 Tahe petroleum geology Oilfield2.1

40、 Hydrocarbon source rocks The main source of oil and gas formation in Tahe oil field is the Garr depression and its western slope. The Cambrian Lower Ordovician source rock thickness of the great depression with Garr (250-500m), wide distribution, good oil conditions (dark undercompensation basin fa

41、cies argillaceous limestone, calcareous mudstone organic carbon abundance of 0.5%-5.52%, is a high abundance and type of organic matter in the source rocks); depression with Garr body the upper Ordovician turbidite basin facies dark mudstone with great thickness, but the low abundance of organic mat

42、ter, non source rocks, but the west edge slope, platform margin of mud mound is ten meters thick dark argillaceous limestone source rocks, organic carbon abundance reached 0.2-0.96%. To sum up, this area is one of the most favorable oil and gas zones in the Tarim Basin, and the main oil generating p

43、eriod is the middle late Caledonian Hercynian, late Hercynian, Indosinian Yanshan and Himalayan periods. It is the main oil supply area of Tabei uplift and slope belt, and has the source conditions of forming large oil and gas fields. Tahe joint 3D area is located in the southern part of Akekule upl

44、ift, since the late Caledonian uplift, has been in a state close to Garr, full of Cambrian Ordovician source depression, is a long-term target areas of oil and gas migration, to capture the oil generating depression in different periods of the formation of oil and gas.2.2 Reservoir The main types of

45、 reservoir of carbonate rock is dolomite, grainstone and biolimestone. But compared with other period in Tarim Basin carbonate platform in the early Paleozoic carbonate platform, such as the Yangtze, North China block and the North American continent on the carbonate platform is smaller, so sediment

46、ary facies and lithology changes. Its outstanding characteristic is affected by tectonic movement, diagenesis, especially the transformation of the role of karst effect, formation of porous reservoir in Tahe oilfield, such as 23 wells, 48 wells, 67 wells Ordovician reservoir area is mainly the lower

47、 Ordovician, lithology sparry grain limestone, grain particle micrite containing, micrite limestone and clay particles, is carbonate open platform Taiwan Shoal and beach sea between interlayer deposition. Experienced multi period structure and karst, form various types of sedimentary and rock combin

48、ation in various physical and chemical deposition, application of karst theory called rock. The reservoir space diversity, mainly three types of pores, holes and cracks. The reservoir properties are mainly controlled by faults and fissures and the degree of communication and control solution of ancient rock and original rock fabric has little relationship. It is also found that the reef beach facies limestone reservoir. With a set of important reservoir in the lower Ordovician large cave, fissure, according to the contribution of combined structure of fracture and karst of Tahe oilfield