龙凤山地区营城组深层优质储层形成机理  

Formation mechanism of deep high-quality reservoirs of Yingcheng Formation in Longfengshan area,Songliao Basin

作　　者：刘曦翔 张哨楠[1,2] 杨鹏[3] 张咏梅 何昊 

机构地区：[1]油气藏地质及开发工程国家重点实验室·西南石油大学,成都610500 [2]西南石油大学地球科学与技术学院,成都610500 [3]中国石化西南油气分公司勘探开发研究院,成都610041 [4]中国石油长庆油田分公司采油二厂华池作业区,甘肃西峰745600

出　　处：《岩性油气藏》2017年第2期117-124,共8页Lithologic Reservoirs

基　　金：国家自然科学基金青年基金项目“大气淡水在碎屑岩次生孔隙形成中的作用”(编号:41302115)资助

摘　　要：近年来,在长岭断陷龙凤山地区埋藏深度大于3000 m的营城组地层中,已有多口钻井获得工业油气流,显示出良好的油气勘探潜力,但其优质储层的形成机理与控制因素均不明确,制约了进一步的油气勘探和开发。综合利用岩心观察、铸体薄片分析、CT扫描、物性测试及恒速压汞等方法,对龙凤山地区优质储层的形成机理与控制因素进行了分析。结果表明:营城组储层物性主要受成岩作用的控制,根据胶结物的特征可划分出压实致密砂岩、绿泥石胶结砂岩和浊沸石胶结砂岩3种类型砂岩;在淡水充注和湖水作用的控制下,储层胶结作用和溶蚀作用均具有明显的分带性,并据此建立了不同砂岩的发育模式。中成岩期浊沸石胶结砂岩受到有机酸的溶蚀,在扇三角洲外前缘形成优质储层分布区,有利于油气的聚集成藏,可作为下一步勘探开发的"甜点"区域。With the new exploration development of Longfengshan area in Changling graben, it is proved that the Yingcheng Formation with burial deeper than 3 000 m has favorable gas exploration potential. Although com- mercial oil and gas flow was produced in several wells, the formation mechanism and controlling factors for high-quality reservoirs remained undefined. Based on the data of core observation, casting thin sections, computed tomography （CT） scanning, physical properties testing and constant-rate mercury penetration, the formation mechanism and controlling factors for high-quality reservoirs were analyzed. The results show that the reservoir property in the study area is mainly controlled by diagenesis. According to this, the reservoirs were divided into compacted tight sandstone, chlorite-cemented sandstone and laumontite-cemented sandstone. The distribution of cementation and dissolution shows the characteristics of obvious zonation under the control of fresh water filling and lake water. The distribution model of various Woes of sandstones was establish edDuring the middle diage-netic stage, the laumontite was dissolved by organic acids produced by source rock, and formed high-quality reservoirs in outer skirt of the fan delta front, which is the ＂sweet point＂ for the further hydrocarbon exploration.

关 键 词：成岩作用 浊沸石胶结 次生溶孔 优质储层 储层分布 龙凤山地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探]