摘要
四川盆地是我国南方最大的含油气盆地,也是我国一个主要的叠合盆地,其海相领域油气地质条件具有3个专属性问题:(①叠合盆地,其特征是盆地基底具三层构造和三分性、沉积盖层纵向演化经历了台地(海相)、盆地(陆相)和褶皱隆升改造三大阶段、现今盆地构造特征可分为4大区11小区;②碳酸岩盐储层,其特征表现为储集岩的孔隙度与渗透率较低、裂缝发育、非均质性较强;③天然气,具来源多样化、运移相态多样化、赋存形式多样化的特征。四川盆地海相领域天然气多由原油裂解而来。影响和控制四川盆地现今油气藏分布最直接的因素及其作用是:烃源控区,储层控层,圈闭控位。四川盆地碳酸盐岩油气藏呈现多样性特征,因此其勘探策略也应多样化。
The Sichuan Basin is the biggest petroliferous basin in southern China and also one of the most important superimposed basins in China. Its specific petroleum geologic conditions of marine facies can be expounded in the following three aspects：（ 1 ）superimposed basin, （2）carbonate reservoir ,and（3 ）natural gas. The Basin is a superimposed basin. Its basement can be divided into three parts. The sedimentary cover had undergone three evolutionary stages, including platform （ marine facies）, basin （ continential facies）, and folding＆ uplifting. Based on the basement and its structural features, the present basin can be divided into four divisions with eleven blocks. The basin contains marine carbonate reservoirs characterized by low porosity and permeability, highly-developed fractures and strong heterogeneity. The basin is rich in natural gas, most of which is cracked gas from oil and is characterized by multiple sources, migration phases, and occurrences. In summary, the controlling factors and their functions for the marine oil ＆ gas distribution in the basin can be boiled down to the following three points： 1 ）hydrocarbon source rocks control the favorable areas of gas occurrence ;2）reservoir quality controls the layers of gas accumulation ; and 3 ） traps control the structural locations of gas accumulation. A diversified exploration strategy is therefore required to deal with the great variety of carbonate oil and gas pools in Sichuan Basin.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2008年第6期781-792,818,共13页
Oil & Gas Geology
关键词
碳酸盐岩
天然气
勘探策略
叠合盆地
四川盆地
carbonate rock
natural gas
exploration strategy
superimposed basin
Sichuan Basin
