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元坝地区中三叠统雷口坡组四段储层特征及其与产能的关系
Relationship between reservoir characteristic and productivity of the fourth member of Leikoupo Formation in Yuanba area
程丽 田雨
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DOI:10.12055/gaskk.issn.1673-3177.2017.02.002
作者单位:中国石化勘探分公司研究院
中文关键字:四川盆地 元坝地区 中三叠世 雷口坡组 岩溶储层 缝洞发育 储层特征 产能
英文关键字:Sichuan Basin; Yuanba area; Middle Triassic; Leikoupo Formation; Karst reservoir; Developed fracture and vug;Reservoir characteristic; Productivity
中文摘要:

四川盆地元坝地区中三叠统雷口坡组四段(以下简称雷四段)储层岩性复杂、岩石结构多样、气水关系复杂,储层与产能关系不明确,雷四段测试选层缺少适用依据。通过研究雷四段储层的基本特征,综合14 口井测试资料,从岩性、物性、电性及储层厚度等四个方面深入研究雷四段储层特征与产能之间的关系,明确雷四段测试层段的优选原则,为雷四段射孔测试提供技术支持。研究认为:①元坝地区雷四段产出能力主要受雷四段溶蚀残留厚度和储层白云化程度影响,储层残留厚度大,且白云化程度高,储层越发育,产能越高;②雷四段裂缝溶蚀孔洞的发育程度与产能密切相关,溶蚀孔洞及裂缝匹配越好、产能越高;③雷四段低阻段厚度与产能呈正相关关系。综合分析可优选雷四段地层白云化程度高、孔隙度发育、裂缝匹配良好、储层残留厚度大且测井电阻率低阻段厚度大于12 m 的储层为元坝地区雷口坡组的测试层段。

英文摘要:

The fourth member of Leikoupo Formation, Middle Triassic, in the Yuanba area of the Sichuan Basin ("Lei 4 Member") is characterized by complex lithology, various rock texture, complex gas-water relation and unclear reservoir-productivity relation, and there is no basis applicable to test zone selection of Lei 4 Member. In this paper, the basic characteristics of Lei 4 Member reservoirs were investigated. Then, the relationship between characteristics and productivity of Lei 4 Member reservoirs were analyzed deeply based on testing data of 14 wells from four aspects, including lithology, physical property, electric property and reservoir thickness. Finally, the principles for selecting test zones of Lei 4 Member were defined. The results provide the technical support for the perforation/testing of Lei 4 Member. It is indicated that the productivity of Lei 4 Member in the Yuanba area is mainly affected by the katatectic thickness of Lei 4 Member and the dolomitization degree of reservoirs. The thicker the residual reservoir is and the more dolomitized the reservoir is, the more developed the reservoir is and the higher the productivity is. The development degree of fractures and dissolved pores of Lei 4 Member is in close relation with the productivity. The better the dissolved pores and the fractures are matched, the higher the productivity is. It is in positive correlation between the thickness of Lei 4 Member low resistance interval and the productivity. Based on comprehensive analysis, the test zone of Leikoupo Formation in the Yuanba area can be acted by the  Lei 4 Member reservoirs which are characterized by high dolomitization degree, developed pore, well matched fracture, thick residual reservoir and low logging resistance interval thickness >12 m.

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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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