The Sequence Stratigraphy And Sedimentary Fades Researching In Western Slope Of Liaohe Eastern Sag

This project summarized the hydrocarbon accumulation in the western slope through thesequence stratigraphy and sedimentary study, and achieved the following results:1.The study area is an inherently developed East-dumping large slope on the centraluplift,including series of large nose-shaped structure as Xinkai-Dongjiagang,Shaling andTiejianglu,which were divided into three steps by several large north-east dumped faults.Multi-stage structural activities caused the complex structural conditions in this area in thesouth,The faults were apparently developed into steps in the area of Xinkai-Dongjiagang,Xinkai Fault has played a very important role in the migration and accumulation of oil andgas. Oppositely In the north,Shaling-Tiejianglu faults were not developed completely, severalsmall faults developed occasionally,the structure Expressed as a simple slope and the stratumof Es31was eroded seriously.2.The multi-provenance type deposition is determined by the tectonic pattern of theslopes in the area. Alluvial fan-River depositional system was developed in early Es3period,Alluvial fan-fan delta depositional system was developed in Es32and Es1period, Alluvialfan-River depositional system was developed in later Es3period.Es3and Es1deposition aremainly controlled by the short axis provenance,Xinkai,Dongjiagang,Shaling and Tiejianglufans were Inherently developed. the main channel of the Alluvial fan root, braided groove,braided channels of the alluvial plain and fan-delta front, subaqueous distributary channel arefavorable reservoir facies3.Affected by the tectonic and sedimentary, stratigraphic and lithologic reservoirsdeveloped in research area. The main types of stratigraphic oil reservoirs include stratigraphicoverlapped reservoir and unconformity blocked oil reservoirs,which developed in the Es1and Es31stratum on the northern slope. The main types of Lithologic oil reservoirs includesandstone lens, updip pinchout, structure and lithologic composited oil reservoirs,whichdeveloped in the Es32stratum of the area of Tiejiaglu and Dongjiagang.4.Different traps causes different reservoir types, and different reservoir types havedifferent major controlling factors. Stratigraphic hydrocarbon reservoirs can be away from theoil source, Hydrocarbon accumulated near the unconformity, can also be coated in the hill,favorable facies and effective reservoir are necessary at the same time. Lithologic oil and gas reservoirs must develope nearby the oil source, or depend on the divert fault system. Differentfacies determine the concentration of oil and gas...