大牛地气田上古生界储层埋藏—成岩演化过程  

Research on Evolution of Burial Diagenesis of Tight Reservior of the Upper Paleozoic in Daniudi Gas Field

作　　者：徐宁宁 邱隆伟[1] 高青松[2] 宋璠 刘绪钢[2] 张向津 姜维[4] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石化华北油田分公司勘探开发研究院,郑州450006 [3]天津方联科技发展有限公司,天津300280 [4]中石化华北油田分公司第一采气厂,郑州450000

出　　处：《沉积学报》2016年第4期735-746,共12页Acta Sedimentologica Sinica

基　　金：国家油气重大专项(2011ZX05009-002)~~

摘　　要：综合运用铸体薄片、扫描电镜、包裹体测温和拉曼分析等资料和方法,从地层埋藏历史、地温、压力、储层成岩特征、储层流体差异和物性演化等方面对大牛地气田上古生界致密砂岩储层成岩—成藏过程进行细致解剖。研究表明：大牛地气田上古生界储层埋藏成岩过程可划分为强机械压实阶段、复杂成岩演化阶段、储层定型阶段和抬升—弱改造阶段。四者对应的典型特征分别为储层强烈减孔（压实率约22.2%~97.5%）;发生两期油气充注（距今约200 Ma和180 Ma）,同时成岩演化类型多样,深刻影响储层物性;发生第三期油气充注（距今约150 Ma）,并且多数储层达到致密化程度（孔隙度小于10%）;构造大幅度抬升,张裂缝弱发育。油气充注早于储层致密化,微裂缝的发育可能为储层渗透率提升的关键。Based on casting thin sections,scanning electron microscope,clay mineral X-ray diffraction,cathodeluminescence,fluid inclusion and laser-raman spectrum,the paper reveals the process of evolution of burial diagenesis of tight reservoir of the Upper Paleozoic in Daniudi Gas Field from aspects including burial history,temperature,pressure,diagenetic feature of reservoir,diagenesis fluid and porosity evolution of reservior. The research shows the process of burial diagenesis can be divided to four stages. They are rapid burial stage（ a） in which the effect of decreasing of primary porosity was remarkable（ compaction rates ranged from 30% to 97. 5%）,complexly diagenetic stage（ b） in which there were two phases of gas charging（ B.P. 200 Ma and B.P 180 Ma）; definition stage for reservoir characteristic（ c） when there was one phase of gas charging（ B.P. 140 Ma） and reservoir tended towards stability and tight and stage of being weak-reworked for reservoir（ d） when amplitude of tectonic uplift was about one kilometer and tension fissure weakly developed. Porosity of most reservoir decreased to 10%,and became tight. With several times of gas charging,the reservoir appeared to present the diagenetic and accumulational model of being tight when gas charging. Hydrpcarbon-changing happened before reservoir＇s being tight. Microfractures may be the key factor for improving reservoir＇s permeability.

关 键 词：鄂尔多斯盆地 大牛地气田 致密砂岩 成岩演化 流体充注 

分 类 号：TE122.2[石油与天然气工程—油气勘探]