Fault Opening And Sealing Properites Of Faulting And Its Effects To Oil Accumulation In Zhongguai Area Of Junggar Basin

Fault is the main conductor of oil and gas transport in Zhongguai area of Junggar Basin,which plays an important role in controlling reservoir in the area.Quantitative study of faults open and close to understand the reservoir distribution,accumulation process and accumulation model is very important.For the complex conditions of oil source and multi type and development of fault system in the study area,comprehensive utilization of geological,seismic and geochemical data,combined with predecessors of Zhongguai regional tectonic background,tectonic stress field and fault evolution research,of typical oil and gas into the reservoir fine dissection and sedimentary facies and faults controlled reservoir evaluation,figure out the main control factors of reservoir and fracture of oil and gas transportation,established for the forming pattern of the area to guide oil and gas in the next exploration.Studies have shown that,in Zhongguai area oil and gas although mainly accumulated in sandy soil than relatively high delta plain diversion channel and delta front underwater distributary channel in,but in contrast,palaeohigh and fracture of oil and gas distribution control effect is more obvious.Ancient uplift controls the macro distribution of oil and gas,and some deep faults and shallow fault is oil and gas vertical to the migration of the main conductor,leading the different layers of oil and gas accumulation.Through fault connectivity probabilistic method,we established the mathematical model of the connectivity probability and the coefficient of opening and closing of the region,and then can be used to quantitatively characterize the connectivity of different parts of the shallow faults.What's more,on the basis of the recognition of reservoir anatomy and major faults sealing,combined with the previous research on migration performance of unconformity surface and sedimentary sand body,we established for the fault opening and closing of quantitative model and reveal the fault control on oil and gas sealing and translocation effects and controlling reservoir significance.