摘要
综合地震、包裹体、烃源岩和生产测试等资料,在构造特征、成藏期次和成藏条件分析的基础上,明确了松辽盆地莺山-双城断陷白垩系致密火山岩气藏的分布特征及成藏主控因素。研究结果表明:(1)莺山-双城断陷经历了3期伸展与3期挤压的构造活动,青山口组沉积末期(84~88 Ma)为主成藏期,研究区处于稳定坳陷期,构造活动弱,有利于气藏的形成与保存。(2)研究区火山岩储层以火山碎屑岩、火山熔岩为主,孔隙度和渗透率分别为9.6%和0.93 mD,沙河子组烃源岩的有机质丰度高,TOC(总有机碳含量)和S1+S2(生烃潜量)分别为2.61%和0.62 mg/g,镜质体反射率Ro平均为3.26%,处于过成熟阶段,天然气通过断裂和不整合面向上运移至营一段致密火山岩并富集成藏。(3)莺山-双城断陷天然气成藏受烃源岩、断层、不整合面、火山体等成藏条件及耦合关系控制,断裂差异性活动控制营一段和沙河子组地层发育和叠加,沙河子组烃源岩发育于北部莺山断陷局部,营一段则集中发育于四站—太平庄断裂之间;气藏集中在Ro大于3.0%的高—过成熟烃源岩附近,高产气井围绕生烃中心呈环状分布;靠近通源断裂与不整合面的爆发相、溢流相储层物性好,是区内重要的天然气富集区。(4)研究区内的天然气藏可划分为莺山断陷“下生上储-断体匹配-近源垂向运移”和双城断陷“侧生侧储-断面耦合-远源侧向运聚”2种成藏模式,莺山断陷的构造-岩性气藏是研究区最有利的勘探区。
Based on the analysis of structural characteristics,reservoir accumulation stages and conditions,the distribution characteristics and main controlling factors of Cretaceous tight volcanic reservoirs in Yingshan-Shuangcheng fault depression of Soliao Basin were determined by using the data of seismic,inclusions,source rocks and production test.The results show that:(1)Yingshan-Shuangcheng fault depression has experienced three-stage extension and compression tectonic activities.During the late sedimentary period of Qingshankou Formation(84-88 Ma)which was the main reservoir accumulation stage,the study area was in a stable depression period with weak tectonic activities,which was conducive to the formation and preservation of gas reservoirs.(2)The volcanic reservoirs in the study area are dominated by pyroclastic rocks and lava,with porosity and permeability of 9.6%and 0.93 mD.The source rocks of Shahezi Formation have high organic abundance,TOC(total organic carbon content)and S1+S2(hydrocarbon generation potential)are 2.61%and 0.62 mg/g respectively,and the average vitrinite reflectance Ro is 3.26%,which is in an over-mature stage.The gas migrated into volcanic rocks of the first member of Yingcheng Formation through faults and unconformities.(3)The natural gas accumulation in Yingshan-Shuangcheng fault depression is controlled by hydrocarbon source rocks,faults,unconformities,volcanic bodies and their coupling relations.The differential activities of faults control the development and superposition of the first member of Yingcheng Formation and Shahezi Formation.The source rocks of Shahezi Formation are developed locally in the northern Yingshan fault depression,while the source rocks of the first member of Yingcheng Formation are mainly developed Sizhan-Taipingzhuang fault.The gas reservoirs are concentrated near the high-over mature source rocks with Ro greater than 3.0%,and the high yield gas wells are distributed circularly around the hydrocarbon generation center.The reservoirs of explosive facies and over
作者
杜长鹏
DU Changpeng(Research Institute of Exploration and Development,PetroChina Daqing Oilfield Company,Daqing 163712,Heilongjiang,China)
出处
《岩性油气藏》
CAS
CSCD
北大核心
2023年第4期115-124,共10页
Lithologic Reservoirs
基金
中国石油“十四五”前瞻性基础性重大科技项目“松辽盆地深部含油气系统研究”(编号:2021DJ0205)资助。
关键词
致密气
近源-远源
爆发相
溢流相
火山岩
营一段
白垩系
莺山-双城断陷
松辽盆地
tight gas
near-source and far-source
explosive facies
overflow facies
volcanic rocks
the first member of Yingcheng Formation
Cretaceous
Yingshan-Shuangcheng fault depression
Songliao Basin
