东濮凹陷盐岩地震地质特征研究
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摘要
东濮凹陷为一典型的盐湖盆地,盐岩与油气成藏关系非常密切,但是盐岩地震反射特征多变,增加了地震岩性预测的难度和不确定性。通过对东濮凹陷盐岩纵横向分布规律的研究,以及对砂、泥、盐岩等地球物理属性的统计分析,落实了砂、泥、盐岩等3种岩性的时空关系和地球物理参数特征。利用正、反演技术明确了盐岩层的地震反射特征除了与密度、速度等参数有关外,还与盐岩层的组合韵律和埋深有关。一般情况下盐岩层具有强振幅、高连续、相对低频的地震反射特征,在盐岩沉积中心厚度较大的特殊情况下,可形成弱反射、较高频、中高连续的地震反射特征。提出在盐岩发育段进行岩性预测宜采用逆向地震储层预测方法,即先将岩盐的分布范围确定下来,然后再进行储层砂体描述。将该方法应用于东濮凹陷多个含盐区块,砂体预测结果与钻井揭示结果相吻合。
There are four sets of halite related to the reservoirs of Eogene in Dongpu depression. But the changeful seismic reflection of halite increases more difficult and more uncertain to predict reservoir, therefore enlarges the exploration risk and debases the well successful ratio. After studied on distribution of halite and analyzed the geophysical characteristics of sand-rock, mud-rock and halite, their spatio-temporal relationship and geophysical parameters are ascertained. Using the forward and inverse modeling techniques, one is conformed that the seismic reflection characteristics of halite are not only influenced by the density and velocity, but also by stratum rhythm and depth. The paper presented that the seismic reflection of halite is usually strong amplitude, good continuity and low frequency. But it also may be a weak amplitude, middle continuity and high frequency reflection at the salt sedimentary center. At last the author pointed out that it is should use the reverse prediction method in salt-bearing formation to obtain a good exploration result.
There are four sets of halite related to the reservoirs of Eogene in Dongpu depression. But the changeful seismic reflection of halite increases more difficult and more uncertain to predict reservoir, therefore enlarges the exploration risk and debases the well successful ratio. After studied on distribution of halite and analyzed the geophysical characteristics of sand-rock, mud-rock and halite, their spatio-temporal relationship and geophysical parameters are ascertained. Using the forward and inverse modeling techniques, one is conformed that the seismic reflection characteristics of halite are not only influenced by the density and velocity, but also by stratum rhythm and depth. The paper presented that the seismic reflection of halite is usually strong amplitude, good continuity and low frequency. But it also may be a weak amplitude, middle continuity and high frequency reflection at the salt sedimentary center. At last the author pointed out that it is should use the reverse prediction method in salt-bearing formation to obtain a good exploration result.
引文
1杨香华,陈开远,石万忠,等．东濮凹陷盐湖层序结构与隐 蔽油气藏[J]．石油与天然气地质,2002,23(2):139-142
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3陈发亮,陈业全,魏生祥,等．东濮凹陷盐湖盆地油气富 集规律研究[J]．盐湖研究,2003,11(4):33-38
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5胥菊珍,蒋飞虎,张孝义,等．河南东濮凹陷古近系沙河 街组盐岩沉积特征及成因[J]．古地理学报,2003,5(2): 162-170
6温铁华．东濮凹陷深部盐的特征[J]．中原油气,1991 (4):15-28
7陈发亮,魏生祥,李绪涛,等．逆向储层预测法与东濮凹 陷深层隐蔽油气藏勘探[J]．石油物探,2002,41(增刊): 204-207
2王秀林,张孝义,王运所,等．东濮凹陷盐岩成因与油气 聚集[J]．大庆石油地质与开发,2002,21(5):11-12,20
3陈发亮,陈业全,魏生祥,等．东濮凹陷盐湖盆地油气富 集规律研究[J]．盐湖研究,2003,11(4):33-38
4李任伟．蒸发盐环境沉积岩有机质和生油研究[M]．北 京:海洋出版社,1993．5-23
5胥菊珍,蒋飞虎,张孝义,等．河南东濮凹陷古近系沙河 街组盐岩沉积特征及成因[J]．古地理学报,2003,5(2): 162-170
6温铁华．东濮凹陷深部盐的特征[J]．中原油气,1991 (4):15-28
7陈发亮,魏生祥,李绪涛,等．逆向储层预测法与东濮凹 陷深层隐蔽油气藏勘探[J]．石油物探,2002,41(增刊): 204-207
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