ISSN 1673-8217 CN 41-1388/TE
主管:中国石油化工集团有限公司 主办:中国石油化工股份有限公司河南油田分公司
田继军, 姜在兴, 陈振林, 陈志勇. 2007: 江陵凹陷新沟嘴组下段砂岩成岩作用及孔隙演化. 石油地质与工程, 21(04): 1-4+9.
引用本文: 田继军, 姜在兴, 陈振林, 陈志勇. 2007: 江陵凹陷新沟嘴组下段砂岩成岩作用及孔隙演化. 石油地质与工程, 21(04): 1-4+9.
2007: Diagenesis and pore evolvement of the lower member of Xingouzui formation sandstone in Jiangling depression. Petroleum Geology and Engineering, 21(04): 1-4+9.
Citation: 2007: Diagenesis and pore evolvement of the lower member of Xingouzui formation sandstone in Jiangling depression. Petroleum Geology and Engineering, 21(04): 1-4+9.

江陵凹陷新沟嘴组下段砂岩成岩作用及孔隙演化

Diagenesis and pore evolvement of the lower member of Xingouzui formation sandstone in Jiangling depression

  • 摘要: 江陵凹陷新沟嘴组下段砂岩主要为岩屑长石砂岩、长石岩屑砂岩及石英砂岩,该储层砂岩属低孔低渗储层。以岩心观察为基础,结合对薄片鉴定、扫描电镜、阴极发光和物性等资料分析后认为,江陵凹陷新嘴沟组下段砂岩经历了压实、石英的次生加大、碳酸盐的胶结及溶蚀溶解、硬石膏的胶结及长石岩屑的溶蚀和粘土杂基的充填等多种成岩作用,目前已达到了晚成岩阶段A期。早成岩期的压实作用以及石英、碳酸盐、石膏、粘土矿物的胶结作用是导致砂岩孔隙度降低的主要原因,分别造成14%和16%的原生孔隙丧失,晚成岩阶段有机质成熟形成有机酸并对不稳定矿物溶解,其产生的次生孔隙发育带是油气勘探的有利区带。

     

    Abstract: The reservoir sandstone from lower member of Xingouzui formation in Jiangling depression is mainly composed of lithic arkose,feldspathic litharenite and quartz sandstone,and it belongs to low porosity and low permeability.Based on core observation,combining with thin section analysis,scanning transmission electron mi- croscope observation,cathodeluminescence analysis and physical property analysis,the sandstone is found to go through several diagenesises such as compaction,quartz overgrowth,cementation and dissolution of carbonate, anhydrite cementation,felspar lithic dissolution,filling of clay matrix,etc.At present,the sandstone has entered into stage-A of late diagenesis period.The compaction of early diagenesis and cementation of quartz,carbonate, anhydrite and clay minerals are the main reasons of de- creased porosity,the compaction makes 14% less,while the cementation reduces it by 16%.The nonresistance mineral is dissoluted by humic acids which come into being at the mature stage of organic matter and the well-devel- oped secondary pore zones generated is the beneficial dis- trict of hydrocarbon exploration.

     

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