摘要
陕北安塞南勘探区长612油藏复杂的地质特征导致探评井产能差异大,是目前制约勘探开发的关键因素,在油藏地质特征研究的基础上,从细化沉积微相、划分成岩相带、储集层微观特征等方面进行了系统分析。研究表明影响探评井产能差异的宏观因素是沉积微相与成岩相的差异,微观因素是非均质性造成的储集层微观特征的差异。中高产探评井分布于Ⅰ类水下分流河道,成岩相带处于绿泥石薄膜胶结-粒间孔相,储集层粒间孔、绿泥石含量高,物性好;低产与纯产水探评井分布于Ⅱ类水下分流河道、河道侧缘,成岩相带处于长石溶蚀相、压实压溶-微孔相、碳酸盐胶结-致密相,储集层粒间孔、绿泥石含量低,物性差。在勘探开发过程中,依据Ⅰ类水下分流河道与绿泥石薄膜胶结-粒间孔相带的展布,优选出有利含油区带,指导探评井部署。
The complex geological characteristics of Chang 612 reservoir in the exploration area in southern Ansai,Northern Shaanxi caused great difference in productivity of exploratory wells,which is currently the key factor restricting exploration and development.Based on the study of geological characteristics of reservoirs,systematic analysis was conducted from the refinement of sedimentary microfacies,division of diagenetic facies belts,and microscopic characteristics of reservoirs.It showed that the difference between sedimentary microfacies and diagenetic facies was the macro factor affecting the productivity difference of exploratory wells,and the difference in reservoir microscopic characteristics caused by heterogeneity was the micro-factor.Exploratory wells with medium and high yield are distributed in typeⅠsubmerged distributary channel.The diagenetic facies belt is in the chlorite film cementation-intergranular pore facies,and the reservoir has good physical properties with high intergranular pores and chlorite content.Low yield and water-producing exploratory wells are distributed in typeⅡsubmerged distributary channel and the lateral margin of channel.The diagenetic facies belt is in the feldspar dissolution facies,compaction and pressure dissolution-micropore facies,and carbonate cementation-dense facies.The reservoir has poor physical properties with low intergranular pores and chlorite content.In the exploration,oil bearing zones were optimized according to typeⅠsubmerged distributary channel and the distribution of chlorite film cementation-intergranular pore facies to guide the deployment of exploratory wells.
作者
张才智
唐锰
强微
苏明
周瑾瑶
刘波
方肖
ZHANG Caizhi;TANG Meng;QIANG Wei;SU Ming;ZHOU Jinyao;LIU Bo;FANG Xiao(No.1 Oil Production Plant of PetroChina Changqing Oilfield Company,Yan′an,Shaanxi 716009,China)
出处
《录井工程》
2020年第4期158-163,共6页
Mud Logging Engineering
关键词
安塞南勘探区
长612油层
产能差异
沉积微相
成岩相
储集层微观特征
exploration area in southern Ansai
Chang 612 oil bearing formation
productivity difference
sedimentary microfacies
diagenetic facies
reservoir microscopic characteristics
作者简介
张才智,高级工程师,1982年生,2006年毕业于长江大学,现在中国石油长庆油田分公司第一采油厂主要从事油田勘探开发工作。通信地址:716009陕西省延安市河庄坪镇。电话:15991113172。E-mail:zhangcz_cq@petrochina.com.cn。
