焉耆盆地博湖坳陷侏罗系剥蚀厚度估算
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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.
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.
引文
[1]付晓飞,李兆影,卢双舫,等.利用声波时差资料恢复剥蚀量方法研究与应用[J].大庆石油地质与开发,2004,23(1):9-11.
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[3]真柄钦次.压实与流体运移[M].陈荷立,译.北京:石油工业出版社,1981.8-30.
[4]韩用兵,王良书,刘绍文.渤海湾盆地济阳坳陷沙四段和孔店组地层剥蚀厚度恢复[J].高校地质学报,2004,10(1):440-447.
[2]Wyllie M R J,Gregory A R,Gardner L W.Elastic wava ve-locities in heterogeneous and porous media[J].Geophysies.1956,21(1):41-70.
[3]真柄钦次.压实与流体运移[M].陈荷立,译.北京:石油工业出版社,1981.8-30.
[4]韩用兵,王良书,刘绍文.渤海湾盆地济阳坳陷沙四段和孔店组地层剥蚀厚度恢复[J].高校地质学报,2004,10(1):440-447.
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