沉积盆地碎屑岩地层孔隙度演化模型分析——以鄂尔多斯盆地延长组为例  

Clastic strata porosity evolution model analysis in sedimentary basins

作　　者：施辉[1] 刘震[1] 潘高峰[1] 胡晓丹[2] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油天然气集团公司东方地球物理勘探有限责任公司油藏地球物理研究中心,河北涿州072751

出　　处：《地质科学》2013年第3期732-746,共15页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家科技重大专项(编号:2008ZX05002)资助

摘　　要：碎屑岩地层孔隙度演化特征的研究已经从定性分析向定量化方向发展,掌握了地层孔隙度在地史过程中的演化规律有助于深化油气成藏机理的认识。本文分别以鄂尔多斯盆地镇泾地区延长组8段砂岩和姬塬地区延长组7段泥岩为研究对象,以现今孔隙度特征为切入点,以地史时间为主线,分别建立了适用于砂岩孔隙度和泥岩孔隙度演化的数学模型。砂岩孔隙度演化模型是总体减孔效应和局部增孔效应数学模型的叠加,前者主要受机械压实和化学压实作用的影响,而后者以溶蚀作用为主。泥岩孔隙度是正常压实趋势下孔隙度演化模型与欠压实段孔隙度增量模型的叠加。It is direction from qualitative analysis to quantitative research for studying clastic strata porosity evolution, kowning well which during geologic process could help to deepen knowledge about hydrocarbon accumulation mechanism. This paper has researched Member 8 sandstones, yanehang Formation in Zhenting area and Member 7 mudstones, Yanchang Formation in Jiyuan area, and has established mathematical models respectively for sandstone and mudstone porosity evolution ,with current porosity characteristics as entry point and geologic time as principal line, combining with research of burial and diagenetic history. Sandstone porosity evolution can be divided to total porosity-decreasing in that mainly mechanical compaction and cementation result and regional porosity-increasing in that mainly dissolution result. So having separately established porosity evolution models of decreasing effect and increasing effect, sandstone porosity evolution model is their addition. Exactly mudstone porosity evolution is the composition of porosity-decreasing mathematical model during normal compaction and porosity- increasing mathematical model during undercompaction.

关 键 词：孔隙度演化 定量模拟 成岩作用 古孔隙度恢复 

分 类 号：P516.13[天文地球—地质学] TE122.1[石油与天然气工程—油气勘探]