鄂尔多斯盆地姬塬地区长2油层低阻主控因素及有效识别方法研究  

Main Controlling Factors of Low Resistivity and Effective Identification Methods for the Chang 2 Reservoir in the Jiyuan Area,Ordos Basin

作　　者：斯扬[1] 牛小兵[2] 梁晓伟[2] 史立川[2] 朱玉双[1] SI Yang;NIU Xiaobing;LIANG Xiaowei;SHI Lichuan;ZHU Yushuang(State Key Laboratory for Continental Dynamics and Department of Geology,Northwest University,Xi’an,Shaanxi 710069;Exploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710069)

机构地区：[1]西北大学,大陆动力学国家重点实验室/地质学系,陕西西安710069 [2]中国石油长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《地质与勘探》2019年第3期882-890,共9页Geology and Exploration

基　　金：国家重大科技专项项目“低渗-特低渗油藏有效开发关键技术”子课题超低渗油藏改善开发效果关键技术(2017ZX05013004);中石油股份公司重大科技专项“长庆油田5000万吨持续高效稳产关键技术研究与应用”子课题“鄂尔多斯盆地超低渗透——致密油藏有效开发技术研究”(2016E-0505)资助

摘　　要：鄂尔多斯盆地姬塬地区三叠系延长组长2段发育低阻油层。为解决前人成果仅适用于局部小区块、无法应用于全区的状况,本文利用地层水分析、相渗实验、岩心物性、测井及试油资料重新对全区长2油层低阻的主控因素进行了分析,并提出了更为有效的适用于全区的判识方法。研究表明:姬塬地区长2油层低电阻率主要控制因素为高矿化度地层水、低含油饱和度、储层物性及淡水泥浆侵入,前三者大幅度降低了油层的电阻率,淡水泥浆的侵入则主要提升了水层电阻率,进一步导致了电阻率增大系数的变小。针对低阻成因的主控因素,提出了侵入因子-综合含油指数交会图法,重新建立了长2低阻油层测井识别图版,该图版与试油符合率达到了94%,能更加有效地识别姬塬地区长2低阻油层。The low-resistance reservoir is common in the Chang2 member of the Yanchang Formation of Triassic in the Jiyuan area,Ordos basin. Previous research on this issue is only applicable to local small blocks,not to the whole area. To further solve this problem,we have analyzed the cause of this low resistance using data of stratum water,phase permeability experiments,core physical property,logging and oil tests and put forward a more effective method to identify the low-resistance reservoir over the whole area. The results show that this low resistivity in the study area is mainly caused by high salinity formation water,low oil saturation,reservoir physical properties and fresh water mud invasion. The resistivity of the reservoir is greatly reduced by the first three factors. The invasion of fresh mud increased the resistivity of the water layer,which further led to the decrease of the resistivity increasing coefficient. In view of the main controlling factors of the cause of low resistance,an intruding factor-synthetic oil index rendezvous method is proposed. The coincidence ratio the interpretation result to the oil test conclusion reached ninety-four percent,which permits to can identify the Chang 2 low resistivity reservoir more effectively in the Jiyuan area.

关 键 词：长2油层 低阻 主控因素 判识方法 姬塬地区 鄂尔多斯盆地 

分 类 号：TE112.1[石油与天然气工程—油气勘探]