椒江凹陷已钻井分析及对油气勘探的启示

Well Analysis of Information from Drilled Wells and Revelation to Oil & Gas Exploration in Jiaojiang Sag

蔡佳 祁鹏 崔敏 宋双 印斌浩

CAI Jia QI Peng CUI Min SONG Shuang YIN Binhao

中海油研究总院, 北京 100028

CNOOC Research Institute, Beijing 100028, China

已钻井分析是油气勘探工作的重要内容，其结果直接关系到一个地区的勘探方向。通过对椒江凹陷的5口井进行分析，总结出失利原因主要为储层物性、圈闭有效性和运移。椒江凹陷的烃源岩以古新统月桂峰组中深湖相泥岩为主，灵峰组浅海相泥岩和明月峰组煤系为辅，但生烃能力有限。主要的储盖组合有四套，凹陷中心成熟烃源岩生成的油气难以通过灵峰组、明月峰组下部厚层泥岩段进入中、上组合，下组合月桂峰组、潜山才是油气成藏的有利组合。勘探策略是从有利生烃中心出发，搞清有利储层分布，寻找近源、输导条件好的构造进行优先勘探，目标以古新统月桂峰组内部的组合为主，兼顾古新统明月峰和潜山成藏组合。

The analysis of information from the drilled wells is an important procedure in oil and gas exploration, and the analysis result is directly related to the determination of exploration direction in some region. Based on the analysis of geological information from 5 wells drilled in Jiaojiang Sag, it can be concluded the failures were resulted by physical properties of reservoir, effectiveness of trap and migration path. In Jiaojiang Sag, the deep lacustrine facies mudstone of Paleocene Yueguifeng Formation is the major source rock, the shallow sea mudstone of Lingfeng Formation and coal-bearing formation of Mingyuefeng Formation, with limited ability of hydrocarbon generation, are auxiliary. There are four reservoir-cap assemblages in the study area. It is diffcult for the hydrocarbon generated from the matured source rock in the center of the sag to migrate through the thick mudstone of Lingfeng Formation and lower Mingyuefeng Formation to the middle and upper assemblages. The effective and favorite assemblages, therefore, are the lower assemblage in Yueguifeng Formation and buried hill. The authors recommend that in the future exploration we should determine the advantageous hydrocarbon generation center at frst, make clear the distribution of reservoir with good physical property, and choose the trap that is near source rock and with good migration condition as the preferential target. The main attention should be mainly focused on the assemblage in Yueguifeng Formation, with consideration to Mingyuefeng Formation and buried hill.

国家自然科学基金资助项目“典型断陷富油气凹陷层序构成样式的差异性研究”（40872077）和国家科技重大专项“近海富烃凹陷资源潜力再评价和新区、新领域勘探方向”（2011ZX05023-001）、“近海大中型油气田形成条件与分布”（2011ZX05023-006）联合资助。

https://doi.org/10.3969/j.issn.1008-2336.2016.04.033