长春岭南区块浅层气成藏条件及其主控因素  

Shallow Gas Accumulation Conditions and Its Main Control Factors in the Changchunling South Block

作　　者：昝春景 季汉成[1] 赵忠波 施尚明[3] Zan Chunjing;Ji Hancheng;Zhao Zhongbo;Shi Shangming(China University of Petroleum(Beijing),Beijing 102249,China;PetroChina Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163711,China;Northeast Petroleum University,Daqing,Heilongjiang 163711,China)

机构地区：[1]中国石油大学(北京),北京102249 [2]中国石油大庆油田有限责任公司,黑龙江大庆163711 [3]东北石油大学,黑龙江大庆163711

出　　处：《特种油气藏》2023年第2期36-43,共8页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金“伸展条件下不同走向断层生长连接模式及伴生圈闭形成机制研究”(42102173)。

摘　　要：浅层气资源分布广泛,勘探开发前景广阔。针对长春岭南区块浅层气分布认识不清的问题,以埋藏较浅的泉四段储层为目的层,通过分析成藏条件,明确主控因素,研究沉积微相和断裂对气藏成藏的控制作用。结果表明:研究区气源主要来自青山口组青一段烃源岩所生成的原油伴生气;储层为河流相沉积,河道砂体厚度大、物性好,有利于浅层气富集;断裂构造和倾斜的储层砂体为浅层气提供了良好的垂向和横向运移通道;研究区具有背斜形态,被南北、北西和少量北东走向的3组断裂切割,构造圈闭条件较好;青一段烃源岩同时作为区域盖层,厚度大,断层在明水组末期停止活动,保存条件良好。沉积微相和断层是研究区浅层气成藏的主控因素,应重点寻找断层-岩性气藏,研究区东部的背斜隆起带为有利勘探区。研究成果为该区块进一步勘探指明了有利方向。Shallow gas resources are widely distributed and have a broad prospect for exploration and development.In view of unclear understanding of shallow gas distribution in the Changchunling South Block,by taking the shallow-buried reservoir at the fourth member of Quantou Formation as the target formation,main controlling factor is specified by analyzing the reservoir forming conditions so as to obtain the controlling effect of sedimentary microfacies and fault on gas reservoir formation.The study results show that the gas source in the research area is mainly derived from the associated gas of crude oil generated by the hydrocarbon source rock at the first member of Qingshankou Formation.The reservoir is the fluvial facies deposition with thick channel sand body and good physical property,which is conducive to shallow gas enrichment.The reservoir sand bodies in fault structure and incline provide good vertical and lateral migration channels for shallow gas.The research area has an anticlinal shape,which is cut by three groups of faults in North-South,NW and a few NE strikes,and the structural trap conditions are good.Meanwhile,the hydrocarbon source rock at the first member of Qingshankou Formation is the regional cap rock with large thickness.The fault stops its activity at the late period of the Mingshui Formation and the preservation condition is good.Sedimentary microfacies and faults are the main controlling factors of shallow gas accumulation in the research area,so fault-lithologic gas reservoirs should be mainly sought,and the anticline uplift zone in the eastern part of the research area is a favorable exploration area.The research results point out a favorable direction for further exploration of this block.

关 键 词：浅层气 成藏条件 主控因素 泉四段 长春岭背斜带 

分 类 号：TE122.2[石油与天然气工程—油气勘探]