The Research Of Reservoir In Zizhou Oilfiele Hejiaji Area

Ordos basin Jingbian oilfield Shawagou area is a Western-leaning monoclinic structures, angle less than1°, gradient abovt10m/km. The Jurassic yanan group yan9widely developed the scale range of uplift, no fracture development. Yanan group yan9formation belongs to meandering river sedimentary, yan9sandstone mainly grey coarse-grained lithic arkose, A period of late diagenetic stage.Under the guidance of the basic theories of sedimentary petrology, reservoir geology and so on, make full use of core, drilling, logging, well logging, and various related analysis assay data, on the basis of previous studies, In accordance with the combination of macro and micro research mentality, used sedimentology,reservoir geology,natural gas geology,petroleum entrapment geology and logging geology as the instruction.Using geological logging, property analysis,scanning electron microscopy, mercury intrusion and other information to study the sedimentary, characteristics, diagenesis,reservoir physical property and microscopic pore structure, We classified the reservoir and analyzed the reservoir’s control factors, and investigated the relationship between reservoir characteristics and gas enrichment; Finally, based on known key effective reservoir anatomy, analysis of effective reservoir distribution and controlling factors, and to effectively predict reservoir distribution.Synthetizing the reservoir quality, the sedimentary facies and the sealing ability of cap rock, etc. We get the factors that control the accumulation as follows:The deep-semi-deep lake mudstone of Chang7formation provided the high quality source rock for the oil accumulation; Fracture offered the migration pathway; The upper mud cap rock and side block of mudstone were essential to the accumulation; structure, the thickness of the sand body, source of oil are the main controlling factors of oil and gas accumulation in this district.