微生物地球化学勘探在准噶尔盆地车排子凸起石炭系中的应用

Application of Microbial Geochemical Exploration Technology in Carboniferous System of Chepaizi Uplift,Jungge Basin

准噶尔盆地车排子凸起石炭系内幕地层结构及构造特征复杂,且储层岩性变化多样。主要以中基性火山岩为主,夹火山碎屑岩及酸性岩类,油气预测较为困难。利用微生物地球化学勘探技术,检测地表土壤中烃氧化菌的丰度差异,研究土壤吸附气的组成特征,来圈定油气分布范围,判别油气藏流体性质。通过此项技术对已完钻的CP13井等进行了验证,吻合较好。另外,还预测了车排子凸起石炭系新部署论证的CP17井含油气情况。研究表明,微生物地球化学勘探技术在车排子凸起石炭系油气勘探方面具较好适用性,符合率达到了90%,降低了勘探风险。

The Carboniferous strata in Chepaizi uplift,Junggar basin are characterized by complex stratigraphic structure and structural features,and various reservoir lithology changes.It is mainly composed of medium basic volcanic rocks,intercalated with pyroclastic rocks and acidic rocks,which makes it difficult to predict oil and gas.Microbial geochemical exploration technology is used to detect the abundance difference of hydrocarbon oxidizing bacteria in surface soil and study the composition characteristics of soil adsorbed gas,so as to delineate the distribution range of oil and gas and identify the fluid properties of oil and gas reservoir.Through this technology,the completed cp13 well is verified,and the results are in good agreement.In addition,the oil and gas situation of CP17 well in the new deployment demonstration of Carboniferous System in Chepaizi uplift is predicted,which shows that the microbial geochemical exploration technology has good applicability in the exploration of Carboniferous system oil and gas in Chepaizi uplift,and the coincidence rate reaches 90%,which reduces the risk of exploration.