四川盆地深层海相碳酸盐岩缝洞型储层预测关键技术——以SN地区茅口组为例

发布时间：2018-02-24 11:50

本文关键词： 四川盆地茅口组气藏三维地震处理正演储集层预测　出处：《天然气地球科学》2017年08期 　论文类型：期刊论文

【摘要】：下二叠统茅口组是四川盆地天然气勘探开发的重要层系之一。缝洞型储层埋藏深且存在着较强的非均质性,测井评价、叠前处理、储层预测难度大。为此,开展地球物理技术攻关研究并形成了配套技术,主要包括:(1)通过对录井、常规测井、电成像和斯通利波测井资料进行深入地分析,建立储层测井响应特征,掌握缝洞纵向分布规律;(2)据此,在静校正、信噪比、一致性和提高分辨率等方面提出保幅处理技术,获得了高精度的地震资料;(3)通过模型正演建立了茅口组储层地震响应模式,指导优选地震属性开展缝洞定性预测;(4)通过叠前随机反演来进行储层的定量预测,采用三维可视化雕刻技术实现碳酸盐岩缝洞单元的空间刻画;(5)在进行缝洞自动追踪基础上,建立离散模型,实现缝洞连通性分析。预测结果经验证与实钻吻合较好,可以为下一步井位部署提供依据,提出"走出构造找岩溶"、"走出浅层找深层"的新思路,对茅口组复杂碳酸盐岩气藏的深化勘探开发和扩展勘探新领域都具有重要的指导意义。
[Abstract]:The Lower Permian Maokou formation is one of the most important strata for natural gas exploration and development in Sichuan Basin. The reservoir is buried deep and has strong heterogeneity. It is difficult to predict the reservoir by logging evaluation and prestack processing. Through the in-depth analysis of logging, conventional logging, electrical imaging and Stoneley wave logging data, the reservoir logging response characteristics were established. On the basis of mastering the vertical distribution of fractures and cavities, the amplitude preserving processing technique is put forward in static correction, signal-to-noise ratio (SNR), consistency and improvement of resolution, and high precision seismic data are obtained. The seismic response model of Maokou formation reservoir is established by forward modeling. The quantitative prediction of reservoir is carried out through prestack random inversion, and the 3D visualization carving technique is used to realize the spatial characterization of carbonate fracture-cavity units. On the basis of automatic tracing of fractures and cavities, A discrete model is established to analyze the connectivity of fractures and cavities. The prediction results are in good agreement with the actual drilling results, which can provide the basis for the next well location deployment, and put forward a new idea of "go out of the structure to find the karst" and "go out of the shallow layer to look for the deep layer". It is of great significance to deepen exploration and development of complex carbonate gas reservoirs in Maokou formation and to expand new exploration fields.
【作者单位】：成都理工大学;中国石油西南油气田公司;
【基金】：中国石油天然气股份有限公司重大科技专项“四川盆地深层海相碳酸盐岩勘探开发技术现场实验”(编号:2014E-3208(GF)) 国家科技重大专项“大型油气田及煤层气开发”(编号:2011ZX05004-005;2016ZX05004-005) 中国石油天然气集团公司重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用”(编号:2016E-06) 中国石油科研项目“安岳气田震旦系碳酸盐岩气藏开发评价与研究”联合资助
【分类号】：P618.13;P631.4

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