川中-川东地区下二叠统茅口组二段白云岩发育规律研究
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摘要
结合四川盆地3 000 km地震剖面实际资料和1 200口井钻井资料,从典型井和典型区块研究出发,地震与地质相结合,研究了川中-川东地区下二叠统茅口组二段白云岩测井、地震等响应特征,寻找茅口组二段白云岩分布的规律。研究结果表明,当茅二a段发育白云岩时,白云岩底界在地震剖面上具有弱-较强反射特征,白云岩发育区呈北西-南东向展布,靠近泥岩发育区左侧边界是白云岩储层发育的最有利区。四川盆地下二叠统茅口组白云岩分布呈条带状大面积分布,勘探潜力巨大,为下一步勘探的接替目标。
Combined with the practical data of 3 000 km seismic profile and 1 200 wells drilling data in Sichuan basin, starting from the typical wells and well blocks, in combination with geological and seismic facies, the characteristics of dolomite logging, seismic response and the distribution regularities of the Maokou formation in the middle Permian were studied. The results show that when the dolomite was developed at MAO 2 a member, the dolomite bottom was of weak-strong reflection characteristics on the seismic section, the dolomite development zone was in the northwest-southeast distribution, and it is the most favorable dolomite reservoir development area near the shale development area on the left side of the border. The distribution of dolomite in Maokou formation of lower Permian in Sichuan basin is a strip of large area and the seismic exploration potential is huge, which is a replacement target for further exploration.
Combined with the practical data of 3 000 km seismic profile and 1 200 wells drilling data in Sichuan basin, starting from the typical wells and well blocks, in combination with geological and seismic facies, the characteristics of dolomite logging, seismic response and the distribution regularities of the Maokou formation in the middle Permian were studied. The results show that when the dolomite was developed at MAO 2 a member, the dolomite bottom was of weak-strong reflection characteristics on the seismic section, the dolomite development zone was in the northwest-southeast distribution, and it is the most favorable dolomite reservoir development area near the shale development area on the left side of the border. The distribution of dolomite in Maokou formation of lower Permian in Sichuan basin is a strip of large area and the seismic exploration potential is huge, which is a replacement target for further exploration.
引文
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[2]李毅,沈浩,石学文,等.川东–川中地区茅口组白云岩成因初探及“热次盆”概念的提出[J].天然气勘探与开发,2013,36(4):1–3,29.
[3]江青春,胡素云,汪泽成,等.四川盆地茅口组风化壳岩溶古地貌及勘探选区[J].石油学报,2012,33(6):949–960.
[4]舒晓辉,张军涛,李国蓉,等.四川盆地北部栖霞组–茅口组热液白云岩特征与成因[J].石油与天然气地质,2012,33(3):442–448,458.
[5]金振奎,冯增昭.滇东–川西下二叠统白云岩的形成机理——玄武岩淋滤白云化[J].沉积学报,1999,17(3):383–389.
[6]张学丰,刘波,蔡忠贤,等.白云岩化作用与碳酸盐岩储层物性[J].地质科技情报,2010,29(3):79–85.
[7]洪海涛,杨雨,刘鑫,等.四川盆地海相碳酸盐岩储层特征及控制因素[J].石油学报,2012,33(2):64–73.
[8]汪华,沈浩,黄东,等.四川盆地下二叠统热水白云岩成因及其分布[J].天然气工业,2014,34(9):25–32.
[9]陈轩,赵文智,刘银河,等.川西南地区下二叠统热液白云岩特征及勘探思路[J].石油学报,2013,34(3):460–466.
[10]宋文海.四川盆地二叠系白云岩的分布及天然气勘探[J].天然气工业,1985,5(4):22–23.
[11]向娟,胡明毅,胡忠贵,等.四川盆地下二叠统茅口组沉积相分析[J].石油地质与工程,2011,25(1):14–
[12]李大军,陈辉,陈洪德,等.四川盆地下二叠统茅口组储层形成与古构造演化关系[J].石油与天然气地质,2016,37(5):756–763.
[13]罗静,胡红,朱遂珲,等.川西北地区下二叠统茅口组储层特征[J].海相油气地质,2013,18(3):39–47.
[14]郭旭升,李宇平,魏全超.川东南地区茅口组古岩溶发育特征及勘探领域[J].西南石油大学学报(自然科学版),2012,34(6):1–8.
[15]苏成鹏,唐浩,黎虹玮,等.四川盆地东部下二叠统茅口组顶部钙结壳的发现及其发育模式[J].古地理学报,2015,17(2):229–240.