A盆地深水区L组海相地层层序地层特征  

CHARACTERISTICS OF SEQUENCE STRATIGRAPHY OF THALASSIC STRATA OF L FORMATION IN DEEPWATER AREA OF A BASIN

作　　者：陈欢庆[1,2] 朱筱敏[1,2] 刘长利 王一博 张义娜 马宏霞[1,2] 韩雪芳[1,2] 向巧维[1,2] 

机构地区：[1]中国石油大学北京油气资源与探测国家重点实验室,北京102249 [2]中国石油大学北京资源与信息学院,北京102249 [3]中国海洋石油研究中心,北京100027

出　　处：《矿物岩石》2009年第1期114-120,共7页Mineralogy and Petrology

基　　金：国家重点基础研究发展规划“973”项目(2006CB202306)

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 stratigraphie 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.

关 键 词：深水区 海相地层 层序地层 地震相 成藏模式 

分 类 号：P539.2[天文地球—古生物学与地层学]