| 断层平面组合样式对盆地砂体沉积的控制作用 |
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| 作者姓名： | 田立新 |
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| 作者单位： | 中海石油(中国)有限公司天津分公司渤海油田勘探开发研究院 |
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| 基金项目： | 国家“十一五”科技重大专项(2008ZX05023-001-004-002) |
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| 摘 要： | 利用三维地震、钻井、测井等资料,研究渤中凹陷石南断层和沉积体系展布,探讨断层平面组合样式对砂体的控制作用.结果表明:石南断层按走向不同可划分为6条分支断层,相邻分支断层在平面上相交构成"凹"型与"凸"型2种组合样式.研究区沙一+二段沉积期,发育辫状河三角洲、滨浅湖滩坝和湖泊等沉积相类型.在石臼坨凸起上发育多个物源供应方向,断层西端多个规模较小的物源可汇聚在一起,形成辫状河三角洲沉积,向湖盆中央延伸较远,规模较大;断层中部为主体物源供应方向,形成单个规模较大的辫状河三角洲沉积.在断层的"凹"型组合部位,容易形成主物源的进积方向,靠近盆地位置容易聚集砂体,在隆起区沿断层发育的古沟谷是碎屑物质进积的主要通道;在紧邻"凸"型组合样式的盆地区,难以形成较大规模的砂体沉积.该规律对寻找处于勘探初期含油气盆地砂砾岩储集层具有积极的意义.
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| 关 键 词： | 渤中凹陷 石南断层 断层组合 沉积相 物源 砂砾岩储集体 |
The combined patterns of faults controlling on sandbody sedimentation |
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| Authors: | TIAN Li-xin |
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| Institution: | TIAN Li-xin(Bohai Oilfield Exploitation and Development Institute,Tianjin Branch of CNOOC Ltd.,Tianjin 300452,China) |
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| Abstract: | Using three-dimensional seismic and drilling/logging data,by researching Shinan fault of Bozhong depression and distribution of depositional system,the paper discusses the control of combination patterns of faults over the sandbody.The results show that the Shinan fault can be divided into six parts according to different strikes,and the combination patterns of the intersection of adjacent sections are "concave" and "convex".In the deposit period of S1+2,it developed the braided river delta,shallow lake beach-bar and lake facies.There were some provenance supply direction in the Shijiutuo raised,and several smaller provenance have come together in the west of fault,formed braided delta deposits,extended far to the central basin,and the scale became larger.It was the main provenance material direction in the central fault,and formed a single large scale braided river delta deposition.At the "concave",it is easy to form the progradation of main provenance and gather sandbody near the basin,and in uplifted area,paleovalleys developing along faults are the main pathways of clastic progradation;while at the "convex" it is hard to build up large-scale distribution of sandbody.This finding has positive significance for good prediction of glutinite reservoir at initial stage of exploration in oil-bearing basin. |
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| Keywords: | Bozhong depression Shinan fault fault combination sedimentary facies provenance glutinite reservoir |
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