大庆长垣浅层气形成条件与分布规律

近年来浅层气成为大庆油田勘探新领域。为了促进浅层气勘探的快速发展,在前人研究基础上,应用录井、测井、试油、地球化学、地球物理等相关资料,对大庆长垣黑帝庙油层浅层气形成条件、分布规律及成藏主控因素进行了系统分析。研究结果表明:长垣黑帝庙油层浅层气存在生物气和伴生气;分流河道、河口坝、远砂坝、席状砂等三角洲前缘相沉积砂体,为浅层气形成提供储集空间;断穿T_1—T_(06)反射层的源储断裂是浅层气的主要运移通道;黑帝庙油层浅层气纵向上主要分布于黑二、黑三油层组,在平面上主要分布于葡南、敖南、杏树岗、萨尔图、喇嘛甸地区的构造高部位;浅层气成藏主控因素为气源、源储断裂和有效构造圈闭。

FORMING CONDITIONS AND DSITRIBUTION LAWS OF THE SHALLOW GAS IN DAQING PLACANTICLINE

In recent years,the shallow gas has become the new area of Daqing Oilfield exploration.In order to improve the fast development of the shallow gas exploration,on the basis of the previous studies,with the help of the relative data 1.e.mud logging,well logging,oil test,geochemical,geophysical informations and so on,the systematical analysis was conducted for the accumulating conditions,distribution laws,main controlling element of the accumulation.The research achievements show that there are biogas and associated gas in the shallow gas of Heidimiao oil layers in the Placanticline;the sedimentary sandbodies of the delta front phase including the distributary channel,mouth bar,far sand bar,sheet sand etc.provide the acccumulating space for the enrichment of the shallow gas;the source accumulation faults penetrating Reflecting Horizon T1-T06 are the principal migrating channels for the shallow gas;the shallow gas in Placanticline Heidimiao oil layers is mainly distributed in Oil Group H2 and H3 vertically,while on the horizon,the gas is generally distributed in the top position of the structures in Punan,Aonan,Xingshugang,Saertu and Lamadian areas;the main controlling elements of the shallow gas accumulation =are the gas sources,source accumulation faults and effective structural traps.