Study On Hydrocarbon Accumulation Of Slope Belt In Baorao Trough Of Jiergalangtu Sag

Jiergalangtu Sag hydrocarbon enrichment,main source subsags is the Baorao Trough in the central of the Sag,Slope belt is the main point to the hydrocarbon migration.After 20 years of exploration course,the difficulty of exploration of oil and gas is bigger.In order to make the remaining oil distribution of the high water-cut stage in the slope belt of underground old oil fields clear,excavate the potential of oilfield further,enhance oil recovery,this requires petroleum geological workers do their utmost to master geological characteristics,reservoiring static factors,oil and gas persuation system,trap types and distribution of the Slope belt of Baorao Trough,summarize hydrocarbon enrichment regularity of slope belt of Baorao Trough,guiding oil and gas exploration and development in the study area.Through the application of earthquake,core,logging,well logging,try oil material,analysis of test data and the previous research results. Analyse and summarize Sedimentary structure characteristics,static reservoiring elements,petroleum system,hydrocarbon enrichment regularity and reservoiring pattern of slope belt of baorao trough of jiergalangtu Sag.Obtain the following results and understanding: 1.The slope belt of bao rao trough include bao rao and xi lin two major tectonic belt,and developing forward-tilted fault block tectonic style; the slope belt of bao rao trough stratum is steep slope,near the source area,the main deposition is coarse clastic fan delta,facies is narrow,connectivity is strong in vertical,connectivity is weak in the horizontal. 2.The source conditions of bao rao trough is advantageous,the combination of reservoir of the slope belt is well,conducive to the formation of hydrocarbon traps. 3.The slope belt of baorao trough has source within a single and double source outside two conduit systems basically,source within a single conduit systems including permeability lithology body and faults,source outside double entry conduit systems including fault-unconformity and connecting sand body-fault-unconformity. 4.The slope belt of baorao trough develop "simple ladder shape" reservoiring pattern ,study area mainly includes structure,strata,lithologic reservoir reservoiring pattern and compound reservoir reservoiring pattern four types. 5.The slope belt of baorao trough includes structural reservoirs and hidden reservoirs,distribute mainly in the main structural belt in the planedistribute mainly in the Teng yi section in the vertical; distribution of a series of structure around the major source is the main place for oil and gas accumulation,tectonic facies control reservoir rock type and concentration level,in the depression,the thick and thin oil distribution has a certain regularity,in general as"the next thin the thick,almost thin thick far". 6.Baorao trough slope belt hydrocarbon enrichment dominative factor aretectonic movement,slope breaks,sedimentary facies and unconformity boundary,oil and gas mainly enriched in the upper and lower strata of the unconformity of source rocks and faults with downthrown traps. 7. Through the comprehensive geological research of baorao trough slope,proposed the regions with large exploration potential:lithologic oil reservoir in baorao inner belt.