南海西部砂泥岩薄互层渗透率评价技术

Evaluation Technology on Permeability of Thin Interbedded Sand Shale Layers in Western Part of South China Sea

郭书生 李国军 张文博 张传举

GUO Shusheng LI Guojun ZHANG Wenbo ZHANG Chuanju

中海石油(中国)有限公司湛江分公司, 广东湛江 524034; 中海油田服务股份有限公司油田技术事业部, 北京 101149

Zhanjiang Branch of CNOOC Ltd., Zhanjiang Guangdong 524034, China; Oilfield Services Limited, CNOOC, Beijing 101149, China

砂泥岩薄互层非均质性强、孔渗关系复杂,特别是有些纹层属厘米级远低于常规测井的分辨率,因此地层评价面临挑战,对海上油气井测试及完井的决策带来风险。针对中国南海西部油田,基于砂泥岩薄互层的岩石类型、渗流特征,应用核磁共振测井及成像测井建立一种新方法,获得一定井段内的薄互层的有效储层厚度,可以鉴别储层类型、求取内在渗透率。通过分析集成已钻井的测井、地层测试和钻杆DST测试资料已证实其可靠性。该技术适用于裸眼测井之后的快速产能评价,对于探井或评价井,可以用最小的成本,为作业者提供测试决策及射孔位置。

The thin interbedded sand-shale layers are highly heterogeneous, and the relationship between porosity and permeability is complex, especially some lamina of centimeter level, far lower than the conventional logging resolution. Therefore, there is great challenge in formation evaluation, which might bring risk to offshore oil gas well testing and well completion. Thus the formation evaluation is facing the challenges. For the oilfields in the western part of South China Sea, by analyzing the rock type and the percolation characteristics, a new kind of method has been developed by using nuclear magnetic resonance imaging data and electric imaging logging data to get the effective reservoir thickness, distinguish reservoir types and calculate intrinsic permeability. It has been confirmed that this kind of method is reliable by analyzing the logging, formation test and DST formation test data. This method can be used for rapid productivity evaluation after the open whole logging, and can be used for making testing decision and perforating strategy with the lowest cost.

国家科技重大专项课题"南海西部海域已证实的富生烃凹陷再评价及新领域勘探方向"(2011ZX05023-001-007)

https://doi.org/10.3969/j.issn.1008-2336.2014.04.065