辽河盆地大民屯凹陷异常压力特征和成因及勘探意义
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摘要
作者结合辽河盆地大民屯凹陷的测井、地质、地震和钻井资料 ,利用等效深度法从沉积和生烃的角度将本区泥岩压实特征分为强超压型、超压型、局部超压型和正常压实型四种 ,平面上 ,靠近各洼陷沉积中心部位是过剩压力的高值分布区 ;纵向上看 ,S33 段下部、S43、S4段地层内超压相对强烈 ,最大压力系数可达 1 .5 5 ,超压带发育幅度大、规模大。凹陷中部的断裂对异常压力分布起着重要的分割作用。快速沉积和生烃作用是本区超压形成的主要原因。
Integrating logging, geological, seismic and drilling data and by means of equivalent depth, four types of compaction style in Damingtun depression are recognized from the view of sedimentation and hydrocarbon generation. They are stong overpressure, overpressure, local overpressure and normal compaction. From the point of plane, the high overpressure occurred in the center of sag. From the point of vertical, there exists relative high overpressure in the bottom of S 3 3 formation, S 3 4and S 4 formation. The highest overpressure factor is up to 1.55. Overpressure is strong and exists widely. The faults act as important shelf for the occurrence of overpressure. Overpressure is mainly due to fast sedimentation and hydrocarbon generation.
Integrating logging, geological, seismic and drilling data and by means of equivalent depth, four types of compaction style in Damingtun depression are recognized from the view of sedimentation and hydrocarbon generation. They are stong overpressure, overpressure, local overpressure and normal compaction. From the point of plane, the high overpressure occurred in the center of sag. From the point of vertical, there exists relative high overpressure in the bottom of S 3 3 formation, S 3 4and S 4 formation. The highest overpressure factor is up to 1.55. Overpressure is strong and exists widely. The faults act as important shelf for the occurrence of overpressure. Overpressure is mainly due to fast sedimentation and hydrocarbon generation.
引文
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[2]陈发景,田世澄.压实与油气运移[M ].武汉:中国地质大学出版社,1989,45-77.
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[4]陈荷立,等编译.油气运移(第2集)[M ].北京:石油工业出版社,1987,26-79.
[5]张博全.压实在油气中的应用[M ].武汉:中国地质大学出版社,1992,49-110.
[6]张立新,李军,刘淑芝,等.试析岐北凹陷异常压力在深层油气藏成藏过程中的控制作用[J]石油勘探与开发,2000,27(5):19-22.
[7]杜栩,郑洪印,焦秀琼.异常压力与油气分布[J].地学前缘,1995,12(3):137-148.
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