摘要
为研究郝滩地区侏罗纪延安组古地貌对油气成藏的影响,利用印模法、残余厚度法及地震剖面恢复郝滩地区前侏罗纪古地貌,分析古地貌油藏成藏特征及控制因素。结果表明:古地貌恢复的上覆基准面为延92底煤层,延10+富县组为印模厚度,下伏基准面为长2底的K7标志层,长1+长2厚度作为残余厚度;郝滩地区前侏罗纪古地貌划分为古河谷、阶地、斜坡、坡嘴、河间丘、低残丘等6个次级古地貌单元,延安组油藏分布在斜坡-低残丘、河间丘和坡嘴等次级古地貌构造单元;郝滩地区延安组发育斜坡-低残丘岩性油气藏、河间丘构造-岩性油藏和坡嘴构造-岩性3种油藏类型,主要受控于古地貌、沉积相、储层物性等因素的影响。古地貌和油气成藏研究对郝滩相邻地区古地貌油气藏研究具有指导意义,同时为其他层位的古地貌油气藏研究提供借鉴。
In order to study the influence of the paleogeomorphology of the Jurassic Yan’an Formation in Haotan area on hydrocarbon accumulation,the palimpsest method,residual thickness method and seismic profiles were used to restore the pre-Jurassic paleogeomorphology in Haotan area,and the hydrocarbon accumulation characteristics and controlling factors of paleogeomorphic reservoirs were analyzed.The results show that the overlying datum plane for paleogeomorphology restoration is the bottom coal seam of Yan 92,the Yan 10+Fuxian Formation is the palimpsest thickness,the underlying datum plane is the K7 marker bed at the bottom of Chang 2,and the thickness of Chang 1+Chang 2 is used as the residual thickness.The Pre-Jurassic paleogeomorphology in Haotan area is divided into six secondary paleogeomorphic units,including paleo-valleys,terraces,slopes,slope noses,interfluve mounds,and low residual mounds.The oil reservoirs of the Yan’an Formation are distributed in secondary paleogeomorphic structural units such as slopes-low residual mounds,interfluve mounds,and slope noses.Three types of oil reservoirs,namely slope-low residual mound lithologic reservoirs,interfluve mound structural-lithologic reservoirs,and slope nose structural-lithologic reservoirs,are developed in the Yan’an Formation of Haotan area,which are mainly affected by such factors as paleogeomorphology,sedimentary facies,and reservoir physical properties.The research on paleogeomorphology and hydrocarbon accumulation has a guiding significance for the study of paleogeomorphic reservoirs in adjacent areas of Haotan,which provides reference for the exploration of paleogeomorphic hydrocarbon reservoirs in other horizons.
作者
刘玉栋
杨博
郭远智
贾银花
LIU Yudong;YANG Bo;GUO Yuanzhi;JIA Yinhua(No.6 Oil Production Plant,Changqing Oilfield Company,PetroChina,Yulin 719000,China)
出处
《西安科技大学学报》
北大核心
2025年第3期607-615,共9页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(41702117)
陕西省科协青年人才托举计划项目(20240701)。
关键词
古地貌
印模
残余厚度
前侏罗纪
郝滩地区
paleogeomorphology
mold
residual thickness
pre-Jurassic
Haotan area
