焉耆盆地博湖坳陷侏罗系剥蚀厚度估算  

Estimation of Erosion Thickness of Jurassic in Bohu Depression, Yanqi Basin

作　　者：张辉[1] 段心建[2] 韩玉戟[2] 张海娇[2] 林水清[2] 

机构地区：[1]中国地质大学地球物理与信息技术学院,北京100083 [2]中国石化河南油田分公司勘探开发研究院,河南南阳473132

出　　处：《新疆石油地质》2006年第4期440-442,445,共4页Xinjiang Petroleum Geology

基　　金：中国石化"十五"基础研究项目;焉耆盆地油气成藏组合基础研究及勘探目标(P00014)资助

摘　　要：剥蚀厚度估算是进行古构造特征研究、烃源岩热演化史模拟和古流体势分析的重要基础工作。根据焉耆盆地的地质特点和现有资料情况,首先在博湖坳陷选择了27口探井,利用泥岩声波时差法进行了单井地层剥蚀厚度估算;然后以这些数据为约束点,选择了10条地震剖面,利用地震剖面追踪法对整个博湖坳陷的侏罗系剥蚀厚度进行了估算。结果表明,在纵向上,侏罗系各组在白垩纪遭受了不同程度的剥蚀,剥蚀最严重的是上侏罗统,其次是中侏罗统头屯河组和西山窑组,下侏罗统三工河组和八道湾组保存相对完整;在横向上,博湖坳陷不同地区遭受的剥蚀程度不尽相同,遭受剥蚀最严重的是种马场低凸起,其次是博湖坳陷北部靠近焉南断裂一带,北部凹陷的四十里城次凹、七里铺次凹和南部凹陷的包头湖次凹遭受剥蚀较轻。The estimation of erosion thickness is a foundation for studying palaeostructural characteristic, modeling source rock thermal evolution history and analyzing palaeo-fluid potential. Based on the geologic feature and available data of Yanqi basin, 27 exploratory wells are chosen in Bohu depression, for which strata erosion thickness of well is estimated by using mud interval transit time method, and then taking these data as the constraining points, 10 seismic profiles are selected, finally, the whole erosion thickness of Jurassic in Bohu depression is estimated by using seismic profile tracing technique. The result shows that vertically, each formation of Jurassic undergoes erosions to a certain extent, the most eroded series is Upper Jurassic, the second is Toutunhe formation and Xishanyao formation of Middle Jurassic, Sangonghe formation and Badaowan formation of Lower Jurassic are well preserved relatively. Laterally, the different areas in Bohu depression are dissimilarly eroded, the most eroded area is Zhongmachang low swell, the second is the area nearby Yannan fault in the northern Bohu depression, while Sishilicheng sub-sag, Qilipu sub-sag in the north sag and Baotouhu sub-sag in the south sag are eroded slightly.

关 键 词：焉耆 博湖 侏罗系 剥蚀厚度 声波时差 地震剖面 

分 类 号：TE111[石油与天然气工程—油气勘探]