塔北隆起西部东河塘油气来源及分布  

Origin and distribution of hydrocarbon in Donghetang Oilfield,west Tabei Uplift,Tarim Basin

作　　者：张斌[1,2] 朱光有[2] 苏劲[2] 卢玉红[3] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国石油勘探开发研究院,北京100083 [3]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《地学前缘》2012年第4期276-283,共8页Earth Science Frontiers

基　　金：国家重点基础研究发展计划"973"项目(2006CB202307);国家自然科学基金项目(41002042)

摘　　要：东河塘油田位于塔北隆起西部,其周缘多个构造带均获得油气,是一个重要的富油气区带,泥盆系东河砂岩和侏罗系地层是两套最为重要的储集层。原油主要来自于中、上奥陶统海相烃源岩,晚海西期和晚喜山期是两个重要的充注期,其中早期形成的油气藏普遍遭受降解破坏,现今发现的正常原油以晚期注入为主。侏罗系还包括晚喜山期库车坳陷生成的陆相油气的注入,白垩系卡普沙良群之下的不整合面是重要的油气运移通道,与之相接触的层位均有机会捕获陆相油气。综合油气地球化学特征与及横向、纵向地质对比,东河砂岩深部的奥陶系、志留系可成为潜在的勘探目的层,而东河塘地区侏罗系陆相油气的存在,进一步拓宽了塔北隆起陆相油气的勘探领域。Donghetang Oilfield was located in the west of Tabei Uplift,Tarim Basin,and a series of oil and gas accumulations have been discovered around it.Hydrocarbons produced in the Donghe sandstone of Devonian（D3d） and Jurassic reservoirs were mainly derived from Mid-upper Ordovician source rocks.According to hydrocarbon charging history,the reservoirs were formed both in the late-Hercynian and late-Himalayan,but the early-accumulated oil and gas were generally biodegraded and destroyed in most places,and the normal hydrocarbons in present reservoirs were formed in the later stage.Besides marine hydrocarbons,some terrestrial oil and gas were found in the Jurassic reservoirs,and the unconformity under K1kp shale was pathway for hydrocarbon migration,and layers connected with the unconformity could capture terrestrial oil and gas from the Kuqa Depression.Based on geochemical characteristics and lateral and vertical comparison,the Ordovician and Silurian reservoirs lain underneath the Donghe sandstone could be the potential exploration formations.The presence of terrestrial hydrocarbons in the Jurassic was very significant,which could further extend the terrestrial hydrocarbon exploration scopes in the Tabei Uplift.

关 键 词：东河塘油田 塔北隆起 油气藏成因 海相油气 油气勘探领域 

分 类 号：P618.130.1[天文地球—矿床学]