辽河盆地沙河街组砂岩中碳酸盐胶结作用对孔隙演化控制机理研究
- 中国科学院兰州地质研究所 兰州 730000
基金项目:
国家自然科学基金
作者简介:
薛莲花,女,30岁,助理研究员,沉积学
摘要: 碳酸盐胶结作用是辽河盆地下第三系沙河街组砂岩中最常见的胶结作用之一，碳酸盐胶结物含量变化大、分布范围广。本文运用扫描电镜、阴极发光、氧碳同位素等方法，对研究区砂岩储层中碳酸盐胶结物的发育状况、形成机制进行了分析，认为有机质演化过程中产生的有机酸、ＣＯ２改变了砂岩的成岩地球化学环境，既为碳酸盐胶结物的溶解创造了条件，又为其沉淀提供了物质来源，从而对砂岩储层孔隙的发育、演化产生重要影响。
Study of Controlling Mechanism of Carbonate Cementation on Porosity Evol ution in Lower Tertiary Sandstones of the Liaohe Basin
- Lanzhou Institute of Keoloxy, Chinese Academy of Sciences, Lanzhou 730000
- Rev Recd Date:
1995-08-04
Abstract: In sandstone carbonate cementation is an important porosity reduction prcxess. Timing of carbonate precipitation and dissolution influences on development and evolution of porosity di-rectly. In Liaohe Basin Low一Tertiary sandstones carbonate cement average content is 10%,the maximum can be to 30% . The extent of carbonate cement distribution varies widely with present depth from 1300 m to 3700 m, and species of carbonate cement are calcite,ferriferous calcite,dolomite and ferriferous dolomite.The SEM,cathodoluminescene emission,oxyen and carbon stable isotopes,etc. analyti-cal methods are adopted in the research of the development mechanism of the carbonate cement in Liaohe Basin reservoir sandstones. Through research,the author indicates that(1)there were two episodes carbonate cementation took place ire sandstones,and the formation of car-bonate cement is related to the sandstone composition,evolution of organic matter and the characteristics of water;(2)there are different influence of two episodes carbonate cementa-tion nn porosity,and effect on the emplacement of hydrocarbon. Early episode precipitated carbonate cement caused pore loss and provided a condition for dissolution secondary porsity,and emplacement of hydrocarbon,late episode carbonate cement precipitation is related to CO2 generated by deoxidation of organic matter and repecipitated in the dissolution porosity,so that a large amount of porosity lost in the B episode of Mid一diagenesis.
薛莲花, 史基安, 晋慧娟. 辽河盆地沙河街组砂岩中碳酸盐胶结作用对孔隙演化控制机理研究[J]. 沉积学报, 1996, 14(2): 102-109.
| 引用本文: |
薛莲花, 史基安, 晋慧娟. 辽河盆地沙河街组砂岩中碳酸盐胶结作用对孔隙演化控制机理研究[J]. 沉积学报, 1996, 14(2): 102-109.
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Xue Lianhua, Shi Jian, Jin Huijuan. Study of Controlling Mechanism of Carbonate Cementation on Porosity Evol ution in Lower Tertiary Sandstones of the Liaohe Basin[J]. Acta Sedimentologica Sinica, 1996, 14(2): 102-109.
| Citation: |
Xue Lianhua, Shi Jian, Jin Huijuan. Study of Controlling Mechanism of Carbonate Cementation on Porosity Evol ution in Lower Tertiary Sandstones of the Liaohe Basin[J]. Acta Sedimentologica Sinica, 1996, 14(2): 102-109.
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