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依据鹿乡断陷岩心、薄片、扫描电镜、X射线衍射及有机包裹体等资料,研究了双阳组储集岩岩石学特征、成岩作用与孔隙演化;运用BasinMod软件进行了地层埋藏史与热史模拟,恢复了双阳组致密储层孔隙演化史;测算了鹿乡断陷成油峰期砂岩可保存孔隙度。结果显示:鹿乡断陷主要经历了压实、胶结、交代、溶蚀4个成岩期,压实和胶结作用是降低孔、渗性能的主要因素。36.5 Ma以前,地层以压实与胶结作用为主,双阳组孔隙度下降了近13%;36.5~30.0 Ma有机质成熟,深部储集岩中硅酸盐与碳酸盐类成岩矿物大量溶解,使溶蚀段孔隙度回升至25%左右,为油气储集提供了良好的次生孔隙空间;10 Ma以后,双阳组地层暂时性抬升而形成微裂隙,此时深部热液沿裂隙侵入造成了裂缝填积、再胶结及白云岩化,但深部双阳组白云岩化作用弱,储集岩孔隙度继续下降。
Based on the data of core, thin slice, scanning electron microscope, X-ray diffraction and organic inclusions in Luxiang fault depression, the petrological characteristics, diagenesis and pore evolution of Shuiyang formation were studied. BasinMod software was used to study the burial history and thermal history The porosity evolution of the tight reservoirs in Shuangyang Formation was recovered and the porosity of the sandstone preserved in the oil peak of the deer depression was calculated. The results show that the deer depression mainly experienced four stages of compaction, cementation, alteration and dissolution in diagenesis. Compaction and cementation are the main factors to reduce pore and permeability. Before 36.5 Ma, the formation was dominated by compaction and cementation, and the porosity of Shuangyang Formation decreased by nearly 13%. The organic matter of 36.5-30.0 Ma matured. The silicate and carbonate diagenetic minerals in deep reservoirs were largely dissolved, The porosity of the segment recovered to about 25%, which provided good secondary pore space for oil and gas accumulation. After 10 Ma, the Shuangyang Formation staged uplift temporarily to form micro-fractures. At this time, deep hydrothermal fluids infiltrated along the fractures and caused fractures , Cementation and dolomitization, but dolomitization in the deep Shuangyang Formation is weak and the porosity of reservoir rocks continues to decrease.