龙凤山地区营城组深层优质储层形成机理

发布时间：2018-04-05 01:01

本文选题：成岩作用　切入点：浊沸石胶结　出处：《岩性油气藏》2017年02期

【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。
[Abstract]:In recent years, in the Yingcheng formation with burial depth greater than 3000 m in Longfengshan area, Changling fault depression, many wells have been drilled to obtain industrial oil and gas flow, which shows good oil and gas exploration potential.However, the formation mechanism and controlling factors of its high quality reservoir are not clear, which restricts the further exploration and development of oil and gas.The formation mechanism and controlling factors of high quality reservoir in Longfeng Mountain area are analyzed by means of core observation, thin slice analysis of cast body CT scan, physical property test and constant speed mercury pressure.The results show that the reservoir physical properties of Yingcheng formation are mainly controlled by diagenesis. According to the characteristics of cementation, there are three types of sandstone: compacted tight sandstone, chlorite cemented sandstone and zeolite cemented sandstone.Under the control of fresh water filling and lake water, the reservoir cementation and dissolution have obvious zonation, and the development models of different sandstone have been established.In the middle diagenetic period, the zeolite cemented sandstone is dissolved by organic acid and forms a high quality reservoir distribution area on the front edge of fan delta, which is favorable for oil and gas accumulation and reservoir formation, and can be used as the "dessert" area for further exploration and development.
【作者单位】：油气藏地质及开发工程国家重点实验室·西南石油大学;西南石油大学地球科学与技术学院;中国石化西南油气分公司勘探开发研究院;中国石油长庆油田分公司采油二厂华池作业区;
【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
【分类号】：P618.13

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