A盆地深水区L组海相地层层序地层特征
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摘要
针对中国南海A盆地深水区缺少钻井资料的现状,运用浅水区钻井资料和深水区地震资料井震结合验证对比的方法,对古近系L组滨、浅海相沉积层序地层特征进行分析,结果表明:该方法能够解决深水区地层地震资料品质差,无井资料、断层复杂、高温高压造成地层破碎层序界面不显,追踪对比困难等难题,还建立了研究区目的层精细三维等时层序地层格架。研究中综合测井及地震资料,识别出SB0,SB1,SB2,SB3和SB4等5个层序界面,将L组自下而上划分为SⅠ,SⅡ,SⅢ和SⅣ等4个三级层序。L组地层共发育7种沉积砂体类型,在各层序高位体系域发育的三角洲、扇三角洲和低位体系域发育的下切谷、斜坡扇、盆底扇和滑塌浊积扇及海侵体系域发育的滩坝等成为有利的砂体发育区域,海侵体系域广泛分布的泥岩则是有利的烃源岩。各种类型的砂体沉积和烃源岩以及盖层可以在空间上形成半地堑和地堑两种成藏模式,发育众多的隐蔽岩性地层油气藏。
The characteristics of sequence of the L Formation of Paleogene age in deepwater area in A Basin in the South China Sea were studied in reference to the classical sequence stratigraphic theory of Vail and seismic and logging data.It was showed that this method could solve the problems of poor quality seismic data,lack of well logging data,complication by tectonic faulting,and fragmentation of stratigraphic sequence.In this method,well-logging and seismic data were used,five sequence boundary of SB0,SB1,SB2,SB3 and SB4 were identified,and four third order sequences of SⅠ,SⅡ,SⅢ and SⅣ were established respectively.Deltas and fan deltas developed in HST,incised valley,slope fan,basin floor fan,turbidite fan developed in LST and beach bar developed in TST were favorable positions for the development of oil-gas pool.Widely distributed mudstone of marine facies was favorable source rock.All kinds of sands and source rock could develop two kinds of accumulation models of graben and horst,forming lots of blind strtigraphic traps.
The characteristics of sequence of the L Formation of Paleogene age in deepwater area in A Basin in the South China Sea were studied in reference to the classical sequence stratigraphic theory of Vail and seismic and logging data.It was showed that this method could solve the problems of poor quality seismic data,lack of well logging data,complication by tectonic faulting,and fragmentation of stratigraphic sequence.In this method,well-logging and seismic data were used,five sequence boundary of SB0,SB1,SB2,SB3 and SB4 were identified,and four third order sequences of SⅠ,SⅡ,SⅢ and SⅣ were established respectively.Deltas and fan deltas developed in HST,incised valley,slope fan,basin floor fan,turbidite fan developed in LST and beach bar developed in TST were favorable positions for the development of oil-gas pool.Widely distributed mudstone of marine facies was favorable source rock.All kinds of sands and source rock could develop two kinds of accumulation models of graben and horst,forming lots of blind strtigraphic traps.
引文
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[3]Robert G Loucks,Stephen C Ruppel.Mississippian Barnett Shale:Lithofacies and depositional setting of a deep-water shale-gas successionin the Fort Worth Basin,Texas[J].AAPG Bulletin,2007,91(4):579-601.
[4]王春修.国外深水油气勘探动态及经验[J].中国海上油气(地质),2002,16(2):141-144.
[5]中国石油集团科技管理部、中国石油经济技术研究院主办,国外油气技术研发动态,2009,1(总第57期),1-12.
[6]金春爽,乔德武,姜春艳.国内外深水区油气勘探新进展[J].海洋地质动态,2003,19(10):20-23.
[7]Henry S P,Paul W.Deepwater remains immature frontier.Offshore,20the new prospecting targets of northern continental Margin ofSouth China Sea[J].Acta Petrolei Sinica,2007,62(10):48-50.
[8]陈斯忠,宋建民,陈伟煌.对海上找气的思考[J].中国海上油气(地质),2003,17(3):153-159.
[9]戴金星,胡安平,杨春,等.中国天然气勘探及其地学理论的主要新进展[J].天然气工业,2006,26(12):1-5.
[10]龚再升.中国近海大油气田[M].北京:石油工业出版社,1997.
[11]陈斯忠,宋建民,陈伟煌.对海上找气的思考[J].中国海上油气(地质),2003,17(3):153-159.
[12]陆永潮,向才富,陈平,等.层序地层在碎屑岩成岩作用研究中的应用[J].石油实验地质,1999,21(2):100-118.
[13]陶维祥,赵志刚,何仕斌,等.南海北部深水西区石油地质特征及勘探前景[J].地球学报,2005,26(4):359-364.
[14]张万选,张厚福,曾洪流,等.陆相地震地层学[M].山东:石油大学出版社,1993.
[15]孙家振,李兰斌.地震地质综合解释教程[M].武汉:中国地质大学出版社,2002.
[16]朱筱敏编著.层序地层学[M].山东:石油大学出版社,2000.
[17]项华,徐长贵.渤海海域古近系隐蔽油气藏层序地层学特征[J].石油学报,2006,27(2):11-15.
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