X油田三叠系延长组长9段低对比度油层成因及识别  

Origin and Identification of Low Contrast Pay Zones in Chang 9 Member of Yanchang Formation in the X Oilfield

作　　者：冯程 冯俊贵 石玉江[3] 冯梓岩 钟云滔 李高仁[3] 毛志强[4] FENG Cheng;FENG Jungui;SHI Yujiang;FENG Ziyan;ZHONG Yuntao;LI Gaoren;MAO Zhiqiang(Faculty of Petroleum, China University of Petroleum-Beijing at Karamay, Karamay, Xinjiang 834000, China;Logging Application Institute, China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710077, China;Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710018, China;Key Laboratory of Earth Prospecting and Information Technology, China University of Petroleum, Beijing 102249, China)

机构地区：[1]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000 [2]中国石油集团测井有限公司测井应用研究院,陕西西安710077 [3]中国石油长庆油田公司勘探开发研究院,陕西西安710018 [4]中国石油大学(北京)北京市地球探测与信息技术重点实验室,北京102249

出　　处：《测井技术》2020年第6期594-600,共7页Well Logging Technology

基　　金：国家自然科学基金青年基金“润湿性影响下的页岩油储层核磁响应机理分析及游离油饱和度定量表征”(42004089);新疆维吾尔自治区自然科学基金青年基金(2017D01B57);新疆维吾尔自治区高校科研计划青年项目“致密油储层复杂润湿性对压裂后产能的影响机制及应用”(XJEDU2017S063)。

摘　　要：X油田长9段低对比度油层发育,测井响应规律复杂,给储层流体性质识别带来了极大困难。结合数值模拟和物理实验,明确地层水矿化度差异大是低对比度油层产生的主要原因,并基于成岩作用和构造作用,弄清地层水矿化度差异大的地质成因。改进电阻率—孔隙度交会图法预测地层水矿化度,利用地层水矿化度预测胶结指数和饱和度指数。采用动态地层水矿化度和胶结指数的方法,较好地识别油层、油水同层和含油水层、水层,有效地提高测井解释符合率,为研究区低对比度油层的识别提供可行的解决办法。Low contrast pay zone develops in Chang 9 member of the study area and the logging responses’laws are complex,which makes reservoir fluid property identification difficult.Combining numerical simulation and petrophysical experiments,it is found that the low contrast pay zones are mainly caused by the great variation of formation water salinity.According to diagenesis and tectonism,the geological origin of formation water salinity variation is clear.The resistivity and porosity cross plot method is improved to predict formation water salinity,which is used for cementation index and saturation index prediction.Pay zones,oil-water layers and water layers with oil,water layers are identified with varied formation water salinity and cementation index,which provides a feasible solution for low contrast pay zone indentification and improves log interpretation coincidence rate in the study area.

关 键 词：测井解释 地层水矿化度 成因分析 电阻率—孔隙度交会图 低对比度 油层识别 低渗透储层 

分 类 号：P631.84[天文地球—地质矿产勘探]