地球物理学进展 ›› 2016, Vol. 31 ›› Issue (5): 2285-2291.doi: 10.6038/pg20160555

• 应用地球物理学Ⅰ • 上一篇    下一篇

鄂尔多斯盆地延长组长7段致密油源储配置关系测井评价

钟高润1, 张小莉1, 杜江民1,2, 郑茜1, 李航3, 李宁3, 王鹏4   

  1. 1. 西北大学大陆动力学国家重点实验室/西北大学地质学系, 西安 710069;
    2. 石家庄经济学院资源学院, 石家庄 050031;
    3. 中石油大港油田公司, 天津 300280;
    4. 陕西地矿第二综合物探大队, 西安 710016
  • 收稿日期:2015-12-20 修回日期:2016-05-15 出版日期:2016-10-20 发布日期:2016-10-20
  • 通讯作者: 张小莉,女,1968年生,教授,博导,从事石油地质与测井方面的教学及科研工作.(E-mail:xiaoli_nwu@163.com) E-mail:xiaoli_nwu@163.com
  • 作者简介:钟高润,男,1990年生,陕西安康人,在读硕士,从事测井资料综合解释与油藏描述.(E-mail:zhongaorun@126.com)
  • 基金资助:

    中国石油天然气股份有限公司重大科技专项“鄂尔多斯盆地致密油勘探开发关键技术研究”(2011E-2602)、陕西省重点学科“地质资源与地质工程”和河北省教育厅资助科研项目(QN2015255)联合资助.

Source-reservoir configuration of logging evaluation for tight oil in Chang 7 member, Yanchang formation, Ordos basin

ZHONG Gao-run1, ZHANG Xiao-li1, DU Jiang-min1,2, ZHENG Xi1, LI Hang3, LI Ning3, WANG Peng4   

  1. 1. State key laboratory for Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, China;
    2. College of Resources, Shijiazhuang University of Economics, Shijiazhuang 050031, China;
    3. PetroChina Dagang Oil-field Company, Tianjin 300280, China;
    4. The No. 2 Comprehensive Geophysical Prospecting Brigade Shaanxi Geological Mining, Xi'an 710016, China
  • Received:2015-12-20 Revised:2016-05-15 Online:2016-10-20 Published:2016-10-20

摘要:

源储配置关系是致密油评价的核心组成部分.以鄂尔多斯盆地延长组长7段的岩心、测井资料为基础,经岩-电关系分析,优选深感应电阻率(RILD)与声波时差(AC)测井参数曲线重叠图法来识别烃源岩,并结合地球化学参数进行烃源岩品质评价;同时,开展砂体结构特征研究,并在单井、连井剖面中综合分析烃源岩品质、砂体结构特征、源储配置关系及含油性.研究表明:1)延长组长7段烃源岩发育段在深感应电阻率(RILD)与声波时差(AC)测井曲线重叠图上存在明显幅度差,累计厚度一般5~70 m,分布面积达10×104 km;岩心分析及测井模型计算TOC值一般2%~20%,平均11.6%,TOC在平面上分布具较强非均质性;基于测试分析数据和实际生产需求,把鄂尔多斯盆地长7段泥页岩分为4类,优质烃源岩:TOC>10%,中等烃源岩:6% < TOC < 10%,差烃源岩:2% < TOC < 6%,非烃源岩:TOC<2%.2)影响鄂尔多斯盆地长7致密油富集程度的关键因素是烃源岩有机碳含量,其次是砂体结构,以及砂体与烃源岩之间的距离.一般在优质和中等烃源岩发育区,紧邻烃源岩的块状砂体的每米日产油指数(PI)一般大于2.0 t/m·d,远离优质或中等烃源岩的块状砂体PI一般为1.5 t/m·d;不论层状砂体与烃源岩的距离远近,PI一般均为1.0 t/m·d.差烃源岩发育区,紧邻或远离烃源岩发育区的块状砂体、层状砂体一般均为差油层或干层.

Abstract:

Source-reservoir configuration is an important part of tight oil evaluation. In this study, based on well logging and core data, we analyzed geologic information carried by various well logging data and used multiple parameters such as Deep Induction Resistivity of induction log (RILD) and Acoustic Transit Time (AC), together with geochemical parameters, to identify and evaluate source rocks in Chang 7 member, Yanchang Formation, Ordos Basin. We studied the sand bodies and evaluated their oiliness on the basis of a comprehensive analysis on source rock quality, sand body structure, and source-reservoir configuration. The study shows:first, at the section that the Deep Induction Resistivity and Acoustic Transit Time logging curve overlaps, there is obvious separation in source rocks in Chang 7 member, where the thickness varies from 5m to 70 m, with an area of up to 10×104 km2. TOC values are between 2% and 20%, with an average of 11.6%.The TOC content of source rocks is horizontally anisotropic. According to the testing data and actual production demand, the source rock characteristics in Chang 7 member can be summarized as the following:high quality source rocks, TOC>10%; medium source rocks,6% < TOC < 10%; poor source rocks, 2% < TOC < 6%; non-hydrocarbon source rocks, TOC<2%. Second, it is indicated that the TOC content of source rocks played a key role in controlling tight oil enrichment, then come to sand body and the distance between sand body and source rocks. In the high quality and medium source rocks development zone, the well testing and oil producing (PI) index of massive sand body are more than 2.0 t/m·d, that of the bedded sand body are about 1.0 t/m·d, the index of massive sand body are in general 1.5 t/m·d in the regions further away from the high quality and medium source rock development zone. In poor source rocks development zones, the two kinds of sand bodies usually are poor oil layers or dry layers.

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