廊固凹陷沙河街组异常高孔带分布特征及成因  

Distribution and Genesis of Abnormal High-Porosity Zones in Shahejie Formation of Langgu Sag

作　　者：陈彦梅[1] 杨德相 李熹微 陈智远[1] 黎凌川 

机构地区：[1]成都理工大学,四川成都610059 [2]中国石油华北油田分公司,河北任丘062552

出　　处：《特种油气藏》2016年第6期45-49,共5页Special Oil & Gas Reservoirs

基　　金：中国石油天然气股份有限公司华北油田分公司协作项目"中深层优质储层成因机制与主控因素研究"(HBYT-YJY-2015-JS)

摘　　要：为加深对廊固凹陷中深层沙河街组优质储层分布情况的了解,依据大量物性资料、铸体薄片、阴极发光薄片、扫描电镜、流体包裹体温度测试、黏土矿物X衍射以及其他相关的分析化验数据,分析了廊固凹陷沙河街组砂岩储层异常孔隙带分布和成因。结果表明：研究区储层纵向上发育3个异常孔隙带,由浅至深依次为2 400~2 600、2 750~3 250、3 800~4 500 m。第Ⅰ、Ⅱ异常高孔带,凹陷内3个主要构造单元均有发育;第Ⅲ异常高孔带只在旧州—固安陡坡带和柳泉—曹家务洼槽带发育。研究认为,异常孔隙带的成因主要是烃类充注、大气淡水淋滤、有机酸溶蚀及超压对储层孔隙的保护作用。研究成果指出了廊固凹陷异常孔隙带分布情况及成因,对廊固凹陷中深层油气开发具有指导意义。Based on comprehensive physical properties,casting thin-section analysis,cathodoluminescence thin-section analysis,scanning electron microscopy,fluid inclusion temperature test,clay mineral X-ray diffraction and other relevant test data,the distribution and genesis of abnormal high-porosity zones in Shahejie Formation of Langgu Sag are analyzed to further determine the distribution of high-quality reservoir in the middle-deep Shahejie Formation of Langgu Sag. Research indicates that there are 3 abnormal high-porosity zones in the longitudinal direction,including 2 400-2 600 m,2 750-3 250 m and 3 800-4 500 m from shallow to deep. Both the Ⅰ and Ⅱ abnormal high-porosity zones all develop in the 3 major tectonic units of Langgu Sag. The Ⅲ abnormal high-porosity zone only develops in the Jiuzhou-Guan steep slope belt and Liuquan-Caojiawu subsag belt. The genesis of abnormal high-porosity zones mainly attributes to hydrocarbon charging,atmospheric fresh water leaching,organic acid corrosion and the protective action of overpressure to reservoir pore. This research presents the distribution and genesis of abnormal high-porosity zones in Langgu Sag and could provide certain guidance for the hydrocarbon development in the middle-deep formations of Langgu Sag.

关 键 词：异常高孔带 沉积相 烃类充注 大气淡水 有机酸超压 廊固凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]