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基于地震波形指示反演的东方B气田 海底扇砂体精细刻画

作    者:晁彩霞1,于俊峰2,王 玉1 ,宋瑞有1 ,张 冲1
单    位:1 中海石油(中国)有限公司湛江分公司;2 广东石油化工学院
基金项目:本文受广东石油化工学院科研启动项目“南海北部水合物微裂缝系统疏导成藏模式”等共同资助
摘    要:
莺歌海盆地东方B气田黄流组为浅海重力流海底扇沉积,砂体分布及叠置关系复杂,导致储层非均质性强, 气水分布规律难以掌握。在层序地层格架建立的基础上,采用高分辨率的相控地震波形指示反演,井-震结合进行砂 体精细刻画。结果表明:黄流组一段低位域发育海底扇沉积,Ⅱb下含气砂组主要为侵蚀水道沉积,砂体厚度大,横向 连续性较好;Ⅱb上含气砂组主要为朵体沉积,局部发育侵蚀水道,砂体沉积厚度薄,横向连续性差;Ⅰa含气砂组主 要为分流水道沉积,砂体厚度薄,且受后期泥质水道侵蚀切割,砂体平面分割性强。实践证明:地震波形指示反演所 反映的水道展布特征符合沉积规律,砂体边界刻画可以解决多口已钻井的气水分布存在的矛盾问题,与后期钻井结 果吻合程度高。
关键词:海底扇;地震波形指示反演;砂体分布;黄流组;莺歌海盆地

Fine characterization of submarine fan sand body in Dongfang B gas field based on waveform indication inversion

Author's Name: CHAO Caixia, YU Junfeng, WANG Yu, SONG Ruiyou, ZHANG Chong
Institution: 
Abstract:
The reservoir of Huangliu Formation in Dongfang B gas field is a gravity flow submarine fan deposit in shallow sea, with complex sand body distribution and superposition relationship, resulting in strong reservoir heterogeneity and difficulty of characterizing gas-water distribution. Based on the establishment of sequence stratigraphic framework, highresolution facies-controlled seismic waveform indication inversion and well-seismic combinational interpretation are used for fine characterization of sand body. The results show that submarine fan deposits are developed in the lowstand system tract of the Huangliu member 1, and a set of eroded channel deposition with large sand body thickness and good lateral continuity mainly developed in the low part of Ⅱ-b gas formation, and a set of lobe body deposition with locally developed erosion channels, thin sand body thickness, and poor lateral continuity mainly developed in the upper part of Ⅱ-b gas formation. Ⅰ-a gas formation is mainly deposition of distributary channel with thin sand body thickness, which is eroded and cut by the later argillaceous channels and present strong plane segmentation of sand body. It is proved that the distribution characteristics of channels reflected by seismic waveform indication inversion conform to the sedimentary law, and the depiction of sand body boundary can solve the problem of the gas-water distributional contradiction of multiple drilled wells, which is highly consistent with later drilling.
Keywords: submarine fan; seismic waveform indication inversion; sand body distribution; Huangliu Formation;Yingge⁃ hai Basin
投稿时间:2020-04-23  


 
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