摘要
鄂尔多斯盆地苏里格东二区走滑断裂结构复杂,断裂控制下的流体差异富集规律及分布特征认识一直不清楚,严重制约了区内目的层有利目标优选及开发调整。针对上述存在的问题,本次研究在地震资料精细地质解释的基础上,开展断裂结构解析,明确断裂的分期、分段特征及其对流体分布的差异控制作用。研究结果表明:(1)研究区走滑断裂在剖面上存在单断类和组合类共2类5型剖面构造样式,平面上组合出线性、斜列式、叠置状、羽状和辫状5种平面结构样式;(2)走滑断裂经历了加里东期—早燕山期挤压、燕山中晚期走滑和喜山期拉张3期构造演化阶段,从深层到浅层断裂结构经历了单断型、花状、雁列式的演化,平面上根据断裂结构样式差异自西向东发育线性剪切段、派生剪切段和混合剪切段3段;(3)不同结构样式的断裂控制不同的流体差异富集模式,研究区共发育单断-封闭-稳产上升型、组合-开启-低产速降型、拉分-半开启-高产缓降型和剪切-半开启-低产缓降型4类流体差异富集模式,其中单断-封闭-稳产上升型和拉分-半开启-高产缓降型日产气量、累产气量均较高且生产稳定,是研究区天然气主要的富集区域。研究成果揭示了走滑断裂对致密砂岩储层流体差异富集的重要控制作用,为区内下一步开发调整指明方向。
Due to the complex structure of strike-slip faults in the EastⅡBlock of the Sulige Gas Field in Ordos Basin,the fluid differential enrichment regularity and distribution characteristics under fault control are unclear,which hamper the optimization and development adjustment of favorable target of the local target layer.To resolve the above problems,based on the fine geological interpretation of seismic data,the fault structural analysis was carried out in this study.The staging characteristics of faults and their differential control effect on fluid distribution were defined.The results show that:(1)The local strike-slip faults have two types of 5 type section structural styles,i.e.single fault type and combination type,and five types of plane structural styles,are combined on the plane i.e.linear,oblique,overlapping,feathered and braidedtypes,(2)The strike-slip fault experienced three stages of tectonic evolution:Caledonian-early Yanshanian extrusion,middle and late Yanshanian strike-slip,and Himalayan extension.From deep to shallow strata,the fault structure underwent the evolution of single fault-type,flower-like,and Yanshanian-type.According to the different fault structural styles,three segment of linear shear segment,derived shear segment and mixed shear segment are developed from west to east.(3)Faults with different structural styles control different fluid differential enrichment modes.Four types of fluid differential enrichment modes are developed in the study area,namely the singlefault-closed-stable production rise type,assembly-open and low-yield rapid decline type,and shear-semi-open and low-yield slow decline type.Among them,the single-fault-closed-stable production rising type and the drawing-semi-open and high-yield slow decline type have higher daily gas production and cumulative gas production and stable production,which are the main local natural gas enrichment area.Our results reveal the important controlling effect of strike-slip fault on fluid differential enrichment in tight sandstone re
作者
宋清
孙盼科
相金元
田发金
吕凤清
贾浪波
姜世一
沈宇豪
徐怀民
张林
何太洪
方向阳
SONG Qing;SUN Panke;XIANG Jinyuan;TIAN Fajin;LÜFengqing;JIA Langbo;JIANG Shiyi;SHEN Yuhao;XU Huaimin;ZHANG Lin;HE Taihong;FANG Xiangyang(College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Oil and Gas Resources and Exploration,China University of Petroleum(Beijing),Beijing 102249,China;Western Drilling Engineering Co.,Ltd.,CNPC,Ordos,Inner Mongolia 017300,China;No.3 Oil Production Plant,Changqing Oil Field,PetroChina,Yinchuan,Ningxia 750000,China;Research Institute of Exploration and Development,Changqing Oil Field,PetroChina,Xi’an,Shaanxi 710000,China)
出处
《现代地质》
CAS
CSCD
北大核心
2023年第5期1110-1122,共13页
Geoscience
基金
国家自然科学基金项目(41902125)。
关键词
走滑断裂
剖面构造特征
平面结构样式
分期演化规律
分段发育特征
流体差异富集
strike-slip fault
section structural characteristic
plan structure style
stage evolution regularity
segmented development characteristic
fluid differential enrichment
