Application of Multi-Factor Matching Model for Hydrocarbon Accumulation to Tarim Basin

The widely distributed Silurian in Tarim basin is one of major oil-gas producing zones.The target zone is characterized by multi-sources,multistage hydrocarbon accumulations and regulation and complicated types,resulting in that the prediction of its oil-gas reservoir distribution is very difficult.According to the multi-factor matching hydrocarbon accumulation model of superimposed basins(T-CDMS) proposed by The Oil and Gas Generation,Accumulation and Distribution Prediction of Typical Superimposed Basins in China,it is predicted that the Silurian in Tarim basin can be as a favorable domain for hydrocarbon accumulation by the method bellow: First,establishing the mathematical model for relationship between the controlling factors and the oil and gas reservoirs,and then quantitatively evaluating individual-process and comprehensive-process reservoir-controlling scope and probabilities for the four main control factors(C for regional cap rocks,D for sedimentary facies,M for paleo-uplift and S for source rocks).The results show that Kongquehe slope,western Yingjisu sag and peripheral Manjiaer sag are the most favorable areas for formation of large oil and gas fields in Silurian target zone;Yingmaili structural belt in Tabei uplift and part areas in Tazhong uplift are the favorable areas;while part areas in Bachu uplift are the relatively small possibility for hydrocarbon accumulation.