川西气田雷四段白云岩储层流动单元测井评价方法

Logging Evaluation Method of Flow Units in a Dolomite Reservoir in the 4th Member of the Leikoupo Formation in Western Sichuan Gas Field

葛祥 温丹妮 叶泰然 张卫峰 张世懋

GE Xiang WEN Danni YE Tairan ZHANG Weifeng ZHANG Shimao

中石化经纬有限公司, 山东青岛 266075 中石化经纬有限公司西南测控公司, 四川成都 610100 中国石化西南油气分公司油气开发管理部, 四川成都 610041 中国石化西北油田分公司勘探开发研究院, 新疆乌鲁木齐 830011

Sinopec Matrix Corporation, Qingdao, Shandong, 266075, China Southwest Logging & Control Company, Sinopec Matrix Corporation, Chengdu, Sichuan, 610100, China Oil and Gas Development Management Department, Sinopec Southwest Oil & Gas Company, Chengdu, Sichuan, 610041, China Exploration and Development Research Institute, Sinopec Northwest Oilfield Company, Urumqi, Xinjiang, 830011, China

川西气田雷口坡组四段白云岩储层开发井型以大斜度井、水平井为主，主要依靠声波时差和二维核磁共振测井资料获得储层信息，储层评价和流动单元评价难度较大。基于关键直井的沉积相、岩心试验数据和储层对比方法，利用测井资料将雷四段储层划分为4类流动单元，利用核磁共振测井资料构建伪毛细管压力曲线，以拟合度较高的中值压力、排驱压力作为中间参数，计算出偏离程度系数（ S 指数和 T 指数），作为定量评价储层孔隙结构的参数，并建立了雷四段储层4类流动单元划分标准。 S 指数、 T 指数结合孔隙度、渗透率等参数，实现了沿水平井筒连续、准确评价白云岩储层孔隙结构和定量区分流动单元的目的。白云岩储层流动单元测井评价方法为同类储层水平井评价和开发方案编制提供了技术参考。

The dolomite reservoir of the 4th member of the Leikoupo Formation in Western Sichuan gas field primarily has highly-deviated wells and horizontal wells, and reservoir information is obtained principally by means of interval transit time and two-dimensional magnetic resonance imaging (NMR) logging data. Therefore, it is difficult to evaluate the reservoir and flow units. Based on the sedimentary facies, core experimental data, and reservoir comparison methods of key vertical wells, the reservoir of the 4th member of the Leikoupo Formation was divided into four types of flow units as determined by logging data. The pseudo-capillary pressure curve was constructed by NMR logging data. The high-fitness median pressure and displacement pressure were taken as intermediate parameters, and the coefficients of deviation degree ( S index and T index) based on the median pressure and displacement pressure were established as parameters for quantitatively evaluating the reservoir’s pore structure. In addition, the classification criteria of the four types of flow units in the reservoir were established. The S index and T index were combined with porosity, permeability, and other parameters for continuously and accurately evaluating the pore structure of the dolomite reservoir along the horizontal wellbore and quantitatively distinguishing flow units. The logging evaluation method of flow units in the dolomite reservoir provides a technical reference for evaluation and development planning for horizontal wells in similar reservoirs.

国家科技重大专项“高放射缝洞性储层测井评价方法”（编号：2017ZX05005-005-010）和中国石化集团公司科技攻关项目“川西海相缝洞储层测井评价技术研究”（编号：JP17043）部分研究内容。

https://doi.org/10.11911/syztjs.2023049