基于井震结合–层序界面逐级约束的小层划分与对比:以杭锦旗十里加汗太原组—下石盒子组为例  

Sub-layer division and correlation based on well-seismic combination and stepby-step interface constraint:A case study of the Taiyuan-Lower Shihezi Formation in the Shilijiahan of the Hangjinqi area

作　　者：李宏涛[1] 陈笛 张占杨 刘庆彬[1] 荀小全[2] 归平军[2] 曹桐生[2] 郝廷[2] 温立峰[1] LI Hongtao;CHEN Di;ZHANG Zhanyang;LIU Qingbin;XUN Xiaoquan;GUI Pingjun;CAO Tongsheng;HAO Ting;WEN Lifeng(Sinopec Petroleum Exploration and Development Research Institute,Beijing 100083,China;Exploration and Development Research Institute of North China Branch Company,SINOPEC,Zhengzhou 450006,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石化华北油气分公司勘探开发研究院,河南郑州450006

出　　处：《沉积与特提斯地质》2024年第2期369-383,共15页Sedimentary Geology and Tethyan Geology

基　　金：中石化科技部项目“东胜气田致密高含水气藏开发潜力研究”(P23133),“杭锦旗十里加汗复杂气藏定量表征及开发对策”(P19019-1),“东胜气田精细表征及有效开发技术”(P20065-2);国家重大专项“大型油气田及煤层气开发”(2016ZX05002-006);贵州省科技重大专项“贵州省页岩气效益开发关键技术及工程技术试验”(黔科合战略找矿[2022]ZD005)。

摘　　要：为了实现鄂尔多斯盆地北部杭锦旗十里加汗太原组—下石盒子组小层精细对比,通过详细的岩心观察,岩心–测井–地震紧密结合,利用岩心标定测井曲线,总结不同级次标志层序界面特征,利用逐级标志层序约束,井震结合进行高频层序划分,结合开发实际,进行小层划分对比。结果表明,研究区太原组—下石盒子组地层厚度在230 m左右,自下而上,由海陆过渡环境的潮坪相—三角洲相沉积,逐渐演变为山西组的辫状河三角洲相沉积,至下石盒子组则主要发育辫状河沉积。依据层序界面类型,将目的层识别出Ⅱ级界面1个,Ⅲ级界面3个,Ⅳ级界面4个。将Ⅱ-Ⅳ级层序界面按照岩心–测井曲线–地震响应特征的难易识别程度,划分了4个级次,进一步通过岩心–测井详细标定,识别V级界面25个。在地震剖面约束和沉积认识指导下,开展不同级别标志界面井间对比,进而逐级约束,实现高频层序对比,结合现场开发实际,将目的层划分为13个小层,各小层厚度较为稳定,主要反映了平原三角洲—辫状河沉积特征。高频层序一定程度上控制着沉积储层的发育与分布。通过井震结合、逐级约束的方法,可提高小层划分对比的准确度和精细度,为该区进一步的气藏地质研究与评价提供基础。This study aims to achieve fine correlation of sub-layers between wells in the Taiyuan-Lower Shihezi Formations in the Shilijiahan of the Hangjinqi area.Based on detailed core observations and core-log-seismic integration,calibrated logging curves are used to summarize the interface characteristics of different levels of marker beds,and high-frequency sequence division is performed by using step-by-step marker bed constraints and well-seismic combination.In combination with development practice,sub-layers division and comparison are carried out.The results indicate that the stratum thickness from the Taiyuan Formation to the Lower Shihezi Formation in the study area is about 230 meters.From bottom to top,the tidal flat facies and delta facies in the transitional environment between sea and land gradually evolved into the braided river delta facies of the Shanxi Formation,and the braided river deposits are mainly developed in the Lower Shihezi Formation.According to the sequence interface types,the target layer is identified as one second-order interface,three third-order interfaces and four fourth-order interfaces.Based on core,logging curve,and seismic response characteristics,the second-fourth order sequence interfaces are divided into four levels.Through detailed corelog calibration,17-18 fifth-order interfaces are further identified.Under the constraint of seismic profile and the guidance of sedimentary characteristics,the inter-well correlation of different marker interface levels is conducted,and then the high-frequency sequence correlation is achieved by level-by-level constraint.In combination with the actual field development,the Taiyuan Formation to the Lower Shihezi Formation can be further divided into 13 sub-layers.The thickness of each sub-layer is relatively stable,primarily reflecting the sedimentary characteristics of plain braided rivers.High-frequency sequences control the development and distribution of sedimentary reservoirs to a certain extent.The well-seismic combination and step-by-step co

关 键 词：杭锦旗 十里加汗 井震结合 逐级约束 高频层序 小层对比 

分 类 号：P631[天文地球—地质矿产勘探]