南堡凹陷古近系深层烃源岩分布特征及厚度预测
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摘要
以层序地层学为依据,利用地震资料和测井信息,建立沉积相、地震相与暗色泥岩之间的关系,对南堡凹陷不同层序地层格架内泥岩、暗色泥岩的分布进行预测。在此基础上,利用测井资料识别有机碳含量的方法,通过统计不同体系域和不同沉积相带泥岩的烃源岩达标率,对南堡凹陷深层烃源岩的分布和厚度进行了预测与评价。结果表明,湖侵体系域和高位体系域下部是烃源岩发育的主要位置。SQ2暗色泥岩和烃源岩厚度占地层总厚度的比例最大,SQ5—SQ8和SQ9次之,但累积烃源岩厚度大体相当。并不是所有的暗色泥岩都可以成为烃源岩,烃源岩的分布与有机质的富集程度有关。
Nanpu sag is a typical Cenozoic petroleum generative depression in Bohai Bay basin. It developed extensive lacustrine mudstone in Paleogene which is distributed within Es3, Es1 and Ed3 formation, and acts as an important material foundation of source rocks for mid-deep layer oil and gas formation. In view of shortage of well even no exploration well, we utilize the proven degree of exploration and subaerial data to predict the distribution of mudstone and dark mudstone depending on sequence stratigraphy and seismic stratigraphy theory. The approval rate that the TOC of source rocks >0.4% in mudstone strata at different depositional facies and architecture can be calculated by using the logging date for the early-stage prediction and evaluation of source rocks. The distribution of heavy mudstone is obviously controlled by depositional center migration on plan, and the distribution of dark mudstone is closely dependant on the sedimentation feature and storage conditions. However, not all the dark mudstones can generate hydrocarbon and the hydrocarbon source rocks mainly concentrated in the lacustrine transgressive systems and the bottom of high stand system in the SQ9, SQ5-SQ8, SQ4-SQ2. Especially,the hydrocarbon rocks of SQ2 of Shahejie formation are the most favorable and contribute greatly to the deep oil and gas concentration and development.
Nanpu sag is a typical Cenozoic petroleum generative depression in Bohai Bay basin. It developed extensive lacustrine mudstone in Paleogene which is distributed within Es3, Es1 and Ed3 formation, and acts as an important material foundation of source rocks for mid-deep layer oil and gas formation. In view of shortage of well even no exploration well, we utilize the proven degree of exploration and subaerial data to predict the distribution of mudstone and dark mudstone depending on sequence stratigraphy and seismic stratigraphy theory. The approval rate that the TOC of source rocks >0.4% in mudstone strata at different depositional facies and architecture can be calculated by using the logging date for the early-stage prediction and evaluation of source rocks. The distribution of heavy mudstone is obviously controlled by depositional center migration on plan, and the distribution of dark mudstone is closely dependant on the sedimentation feature and storage conditions. However, not all the dark mudstones can generate hydrocarbon and the hydrocarbon source rocks mainly concentrated in the lacustrine transgressive systems and the bottom of high stand system in the SQ9, SQ5-SQ8, SQ4-SQ2. Especially,the hydrocarbon rocks of SQ2 of Shahejie formation are the most favorable and contribute greatly to the deep oil and gas concentration and development.
引文
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[2]周海民,董月霞,刘蕴华,等.小型断陷盆地油气勘探理论与实践——以渤海湾盆地南堡凹陷为例[M].北京:石油大学出版社,2001.
[3]周海民,魏忠文,曹中宏,等.南堡凹陷的形成演化与油气的关系[J].石油与天然气地质,2000,21(4):345-349.
[4]徐亚军,杨坤光,董月霞,等.冀东南堡凹陷断裂系统的多重分形研究[J].油气地质与采收率,2005,12(1):36-37,41.
[5]董月霞,周海民,夏文臣.南堡凹陷第三系层序地层与油气成藏的关系[J].石油与天然气地质,2003,24(1):39-41.
[6]周海民,汪泽成,郭英海.南堡凹陷第三纪构造作用对层序地层的控制[J].中国矿业大学学报,2000,29(3):326-330.
[7]李群,王英民,邱以刚,等.层序单元体系域划分及勘探意义[J].石油勘探与开发,2003,30(3):23-26.
[8]王瑞菊,邓宏文,李世臻.珠一坳陷古近系层序地层及沉积体系[J].油气地质与采收率,2009,16(5):4-7.
[9]吴常玉,肖淑明,王立军.井震约束下的高分辨率层序地层学对比方法及其应用[J].油气地质与采收率,2009,16(3):61-64.
[10]邹才能,池英柳,李明,等.陆相层序地层学分析技术[M].北京:石油工业出版社,2004.
[11]郑红菊,董月霞,王旭东,等.渤海湾盆地南堡富油气凹陷烃源岩的形成及其特征[J].天然气地球科学,2007,18(1):16-19.
[12]刘震,常迈,赵阳,等.低勘探程度盆地烃源岩早期预测方法研究[J].地学前缘,2007,14(4):159-167.
[13]于建国,韩文功,于正军,等.济阳拗陷孔店组烃源岩的地震预测方法[J].石油地球物理勘探,2005,40(3):318-321,338.
[14]张寒,朱光有.利用地震和测井信息预测和评价烃源岩——以渤海湾盆地富油凹陷为例[J].石油勘探与开发,2007,34(1):55-60.
[15]赵文智,何登发.石油地质综合研究导论[M].北京:石油工业出版社,1999.
[16]张振英,邵龙义,柳广弟,等.南堡凹陷无井探区烃源岩评价研究[J].石油勘探与开发,2004,31(4):64-67.
[17]王贵文,朱振宇,朱广宇.烃源岩测井识别与评价方法研究[J].石油勘探与开发,2002,29(4):50-52.
[18]许晓宏,黄海平,卢松年.测井资料与烃源岩有机碳含量的定量关系研究[J].江汉石油学院学报,1998,20(3):8-12.
[19]朱光有,金强,张水昌,等.烃源岩非均质性的控制因素研究——以东营凹陷为例[J].矿物岩石,2003,23(4):95-100.
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