海外页岩油气纵向地质甜点识别方法

发布时间：2017-12-26 23:28

本文关键词：海外页岩油气纵向地质甜点识别方法　出处：《中国矿业》2016年12期 　论文类型：期刊论文

【摘要】：准确识别页岩油气地质甜点、确定关键识别参数、优选水平井靶点是开展页岩油气研究急需解决的问题。勘探开发实践表明,页岩油气的地质甜点为"甜点体",其纵向上遵循从远景段、有利段、核心段,再到甜点的递进识别过程。本文以北美Eagle Ford组页岩为例,从构造沉积背景确定了浅海-半深海相沉积的下白垩统为远景段;利用野外露头和钻井岩芯,通过层序地层分析明确了Eagle Ford组为晚白垩世的有利页岩发育层;结合测井解释得出了下Eagle Ford段为该组的核心段;同时,提出了自然伽马、有机碳含量、电阻率、含烃饱和度4类测井曲线进行划分核心段和识别纵向甜点段的应用方法。在此基础上,通过观察扫描电镜和薄片资料,分析A、B、C三个亚段生烃能力和储集能力,明确了下Eagle Ford段的B亚段为纵向地质甜点。分析PH、EM、BL三口井初始产量和水平井段钻井轨迹在A、B、C三个亚段的钻遇时间,结果显示B亚段对页岩油气较高产量贡献率最大,是下Eagle Ford段最佳的水平井靶点优选位置。
[Abstract]:It is an urgent problem to identify shale oil and gas geological desserts, determine key identification parameters and optimize horizontal well targets, which are urgently needed to be solved in shale oil and gas research. The practice of exploration and development shows that the geological sweets of shale oil and gas are "sweet bodies". They follow the progressive identification process from the prospective section, the favorable section, the core section to the dessert. The North American Eagle Ford shale as an example, from the structural and sedimentary background determines the neritic bathyal sedimentary facies of Lower Cretaceous period for the long-term use; outcrop and drilling cores, through sequence analysis identified Eagle Ford group for the favorable shale of the late Cretaceous formation; combined logging interpretation was obtained under Eagle the Ford segment is the core section of the group; at the same time, a new method of using natural gamma, organic carbon content, resistivity, hydrocarbon saturation of 4 kinds of logging curves are divided into core section and longitudinal section of the dessert identification. On this basis, by observing SEM and slice data, the hydrocarbon generation capacity and storage capacity of three sub segments of A, B and C were analyzed, and the B sub segment of Eagle Ford segment was identified as a vertical geological dessert. The drilling time of three wells in PH, EM and BL wells in three sub segments of A, B and C is analyzed. The results show that the contribution rate of B subsection to shale oil and gas production is the largest, which is the best horizontal well target location in the lower Eagle Ford section.
【作者单位】：中海油研究总院;中国石油天然气股份有限公司大港油田公司勘探开发研究院;中国华电集团清洁能源有限公司;
【基金】：中国海洋石油国际有限公司生产项目“Eagle Ford和Niobrara项目综合研究”资助(编号:2014FS-008) 中海石油(中国)有限公司综合科研项目“海外页岩油气产能评价技术与方法研究”资助(编号:YXKY-2016-ZY-03)
【分类号】：P618.13
【正文快照】： 页岩油气主要以钻水平井的方式进行开采[1-2],水平井靶点(水平段着陆点)的选择对提高产量至关重要。从地质角度而言,水平井靶点处于页岩油气地质甜点上,即页岩品质最佳的目的层段。目前,对页岩油气地质甜点的研究主要集中在利用地质参数等值线叠加寻找地质“甜点”[3-5]和利用

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