| Research work area is oil extraction factory Che76well block, located in the JunggarBasin, the western uplift the southern tip of Hung-Che fault zone in the Chief under theKaramay fifty-five territory of the town, the work area surface is the Gobi and farmland,relatively flat terrain, ground elevation300m-330m, the average ground elevation of315m.Block of Che76wells has developed the Che2well area Qigu reservoir, oil built-in simpleand asphalt road through the convenient transportation. Constructed on the west car row ofsub-convex, north of Zhong guai convex, east Haven depression, south Sikeshudepression.The study area is approximately93.5km~21. Stratigraphic division and correlationThrough in analysis in previous research results, missing Toutunhe strata in in studyarea, the region SQ1(J1b), the SQ2(J2x) and the SQ3(J3q) stratigraphic features similarstrata are developed in in study area mid and easternwestern strata in in study area has beencompletely denuded.The study also found that their residual thickness, in SQ1stratigraphicresidual thick0-310m, the SQ2residual thickness of0-340m, in SQ3residual thickness ofthe0-250m; but their distribution is characterized in the same stratum in the study area innortheasternin development of thickest, southeast of development followed by, the easternpart of development is thinnest.Strata SQ4(K1q) has development in the Che76wells, the residual thickness is110-270m; strata western thin and northeast thick2.On sedimentary faces Deposition system of the Che76wells located throughout the layer inheritance poorBadaowan Formation during the deposition of the provenance system more complex, thereare three things from different directions source; the Xishanyao Formation during thedeposition from the west and southwest material source is gradually shrinking until itdisappears, the northern source is gradually expanded to become the main source of systemof the study area, the larger sphere of influence until the southern study area; QiguFormation during the deposition of the northern provenance began to shrink, the westernprovenance graduallyenhance the study area, deposition jointly controlled by theprovenance system。Depositional environment research, the study area, sandstone, widely distributed, thelarger thickness. Jurassic, and the the Qingshuihe Formation in the study area delta frontunderwater distributary channel sandstones, mouth bar sandstone, delta front distributarychannel sandstones is a good migration channels, is also a good oil and gas reservoir layer.The oil and gas migration to the northwest along the structural highs, and accumulation inthe parts with good reservoir conditions。3.On hydrocarbon accumulation characterThrough the analysis of the structure and evolution of the the study area, the fault ofthe study area can help oil and gas migration and accumulation, the Yanshanian the tectonicmovement helps the oil and gas traps. Thick mudstone of Sangonghe Formation is a bettercap，Badaowan Formation have good hydrocarbon accumulation conditions; the XishanyaoFormation hydrocarbon accumulation is mainly controlled by the sand body developmentposition, the sandstone reservoir space; the Qigu Formation into possession of controlledtrap conditions。There are two main types reservoir of the the study area: structural reservoirs,stratigraphic-structural reservoir. Start from the existing wells with obtain hydrocarbonindications, on the basis of stratigraphic classification, and analysis of hydrocarbonmigration law. Studies of Hydrocarbon migration law: of Jurassic oil and gas migrationalong the highs structural and accumulation in the fault block。... |
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