大池干井、黄草峡构造嘉二~2储层预测
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摘要
近几年,在川东大池干井构造和黄草峡构造上,池57井、草31井都在下三叠统嘉陵江组嘉二2获得高产工业气流。为了在嘉二2获得更好的经济效益,就有必要搞清川东嘉二2储层的地质、测井特征及其分布规律。但嘉二2岩性变化大、储层薄的特点给储层预测工作带来了极大的困难。对池57井和草31井的测井资料的分析可知,嘉二2岩性在石灰岩、白云岩及石膏之间变化,而其储层主要发育在白云岩中,厚度为2~15m。对过池57井、草31井的2条地震测线做Strata速度反演和DCI密度反演,分析结果可知2条测线的密度反演剖面要好于速度反演剖面,与实际地质、测井情况更加吻合。根据川东嘉二2储层声波变化不大,而密度相对围岩要小的特点,文章提出用Strata速度反演与DCI密度约束反演联合识别川东嘉二2薄储层的方法。
In recent years, the high producing gas flow has been achieved from T_1j2_2 (second submember of the second member of Jialingjiang Formation, Lower Triassic) in wells Chi-57 and Cao-31 in Dachiganjing and Huangcaoxia structures in East Sichuan. It is necessary for raising economic returns to find out the geological and logging features of T_1j2_2 reservoir and its distribution law, but it is very difficult to predict the T_1j2_2 reservoir because of its changeful lithology and small thickness. Through analyzing the log data of wells Chi-57 and Cao-31, it was indicated that the lithology of T_1j2_2 is changeable among limestones, dolostones and gypsolytes, and its reservoir is mainly composed of dolostones with thicknesses of 2-15 m. In light of analyzing the data on Strata velocity inversion and density constraint inversion of two seismic lines passing through wells Chi-57 and Cao-31, it was shown that the density constraint inversion results are better than the strata velocity inversion results, the former being more coincident with the actual geological and logging circumstances. According to the characters of the little acoustic variation and small density (relative to surrounding rock) of the T_1j2_2 reservoir in East Sichuan, the method of identifying the T_1j2_2 thin reservoir by combining the strata velocity inversion with the density constraint inversion is put forward in the paper.
In recent years, the high producing gas flow has been achieved from T_1j2_2 (second submember of the second member of Jialingjiang Formation, Lower Triassic) in wells Chi-57 and Cao-31 in Dachiganjing and Huangcaoxia structures in East Sichuan. It is necessary for raising economic returns to find out the geological and logging features of T_1j2_2 reservoir and its distribution law, but it is very difficult to predict the T_1j2_2 reservoir because of its changeful lithology and small thickness. Through analyzing the log data of wells Chi-57 and Cao-31, it was indicated that the lithology of T_1j2_2 is changeable among limestones, dolostones and gypsolytes, and its reservoir is mainly composed of dolostones with thicknesses of 2-15 m. In light of analyzing the data on Strata velocity inversion and density constraint inversion of two seismic lines passing through wells Chi-57 and Cao-31, it was shown that the density constraint inversion results are better than the strata velocity inversion results, the former being more coincident with the actual geological and logging circumstances. According to the characters of the little acoustic variation and small density (relative to surrounding rock) of the T_1j2_2 reservoir in East Sichuan, the method of identifying the T_1j2_2 thin reservoir by combining the strata velocity inversion with the density constraint inversion is put forward in the paper.
引文
[1]黄平,川东石炭系储层预测及岩性圈闭识别探索性研究,西南油气田分公司,1998
[2]黄平,Jason和Strata技术在川东北飞仙关组储层预测研究中的应用,西南油气田分公司,2002
[3]杨智仁,川东嘉二2储层地震模式识别(方法)研究,西南油气田分公司,2003
[4]杨智仁,沙坪场构造地震老资料重新处理解释,西南油气田分公司,2003
1李正文.高分辨率地震勘探.四川成都:原成都科技大学出版社,1993
2雍世和.测井资料综合解释与数据处理.北京:石油工业出版社,1982
[2]黄平,Jason和Strata技术在川东北飞仙关组储层预测研究中的应用,西南油气田分公司,2002
[3]杨智仁,川东嘉二2储层地震模式识别(方法)研究,西南油气田分公司,2003
[4]杨智仁,沙坪场构造地震老资料重新处理解释,西南油气田分公司,2003
1李正文.高分辨率地震勘探.四川成都:原成都科技大学出版社,1993
2雍世和.测井资料综合解释与数据处理.北京:石油工业出版社,1982
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