川东地区嘉二~2储层地震预测技术
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摘要
川东地区嘉二2亚段为低孔、低渗、非均质性十分强烈的裂缝—孔隙型储集层,具有层多、层薄、纵横向变化大的特点,其测井响应特征为高中子、高声波、低伽马、低密度,在时间剖面上异常特征不明显,特殊处理剖面上的响应特征一般为低速、高吸收、低密度、低伽马值、小断层发育的含气模式。文章利用现有的地质、钻井、测井及地震资料,进行了多种特殊处理方法试验及解释,建立嘉二2亚段地震响应模式,总结了一套行之有效的嘉二2亚段地震预测方法。依据各区块的岩性差异,对膏质含量较重的区块用速度反演、密度反演及瞬时相位剖面联合解释储层;对泥质含量较重的区块用速度反演、伽马反演及瞬时相位技术共同预测储层,寻找有利区。
The T_1j2_2 (second submember of the second member of Jialingjiang Formation, Lower Triassic) reservoir in East Sichuan is a fractured-porous reservoir with the characteristics of low porosity, low permeability, strong heterogeneity, multiple-layer, thin-layer and great vertical and horizontal thick change, etc. Its log response was characterized by high neutron log, high acoustic log, low gamma-ray log and low density log; its abnormal features were unnoticeable on seismic time section; and it seismic response characteristics on the special-purpose processing sections expressed as a gas-bearing mode of low velocity, high absorption, low density, low gamma-ray and little-fault development. By use of the existent geologic, drilling, log and seismic data and through testing and interpreting many kinds of special-purpose processing methods, the seismic response mode of T_1j2_2 reservoir was set up and a set of effective seismic prediction techniques of T_1j2_2 reservoir were summarized by the authors. According to various lithologic characters in different areas, it was suggested that the beneficial T_1j2_2 reservoirs at high gyps content areas may be comprehensively interpreted by use of the velocity inversion, density inversion and instantaneous phase techniques and those at high shale content areas by use of the velocity inversion, gamma-ray inversion and instantaneous phase techniques.
The T_1j2_2 (second submember of the second member of Jialingjiang Formation, Lower Triassic) reservoir in East Sichuan is a fractured-porous reservoir with the characteristics of low porosity, low permeability, strong heterogeneity, multiple-layer, thin-layer and great vertical and horizontal thick change, etc. Its log response was characterized by high neutron log, high acoustic log, low gamma-ray log and low density log; its abnormal features were unnoticeable on seismic time section; and it seismic response characteristics on the special-purpose processing sections expressed as a gas-bearing mode of low velocity, high absorption, low density, low gamma-ray and little-fault development. By use of the existent geologic, drilling, log and seismic data and through testing and interpreting many kinds of special-purpose processing methods, the seismic response mode of T_1j2_2 reservoir was set up and a set of effective seismic prediction techniques of T_1j2_2 reservoir were summarized by the authors. According to various lithologic characters in different areas, it was suggested that the beneficial T_1j2_2 reservoirs at high gyps content areas may be comprehensively interpreted by use of the velocity inversion, density inversion and instantaneous phase techniques and those at high shale content areas by use of the velocity inversion, gamma-ray inversion and instantaneous phase techniques.
引文
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2 王罗兴,谢芳.川东北部飞仙关组鲕滩气藏地震响应特征及勘探展望.天然气工业,2000;20(5)
3 陆基孟主编.地震勘探原理.北京:石油工业出版社,1993
4 王英华著.中下扬子区海相碳酸盐岩成岩作用研究.北京:科学技术文献出版社,1991
5 谢里夫RE,吉尔达特LP编,初英等译.勘探地震学.北京:石油工业出版社,1999
6 王允诚编著.油气储层评价.北京:石油工业出版社,1999
7 罗蛰潭,王允诚.油气储集层的孔隙结构.北京:科学出版社,1986
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