鄂尔多斯盆地苏里格庙气田上古气藏成藏机理研究

Study on Forming Law of Upper Paleozoic Gas Reservoir in Suligemiao Gas Field,Ordos Basin

苏里格庙气田是上、下古生界 2套含气层系叠合发育区 ,通过对其上古气藏成藏规律系统研究 ,得出 :天然气生成、运移和保存条件较好 ,气源岩主要为石炭—二叠系海陆过渡相至陆相的含煤地层 ,所产气为高成熟裂解气 ;气田处于油气就近运移的指向带上 ,利于天然气富集 ;砂体的储集物性横向非均质性强 ,天然气聚集不严格受控于构造 ,形成局部透镜状盒8至山2 段岩性圈闭气藏 ;气藏表现为负异常流体压力的特征 ,并具有特有的分布规律。

Suligemiao gas field is a congruent zone formed by upper and lower Paleozoic gas-bearing bed.By studying the forming law of Suligemiao gas field systematically.This paper comes to the conclusions that the generating,migrating and consecrating conditions of the natural gas are fairly good.Gas-bearing reservoir is mainly coal-bearing formation within transitional facies and land facies of Permo-Carboniferous system,which generates high mature cracked gas.Suligemiao gas field is situated in the nearest directional zone from hydrocarbon migrating path,it becomes the favorable region collecting the hydrocarbon.Most of natural gas cumulate in the segment from H_8 to Sh_1.The transverse heterogeneity of sandy collecting characteristics is sharply distinguished from circumference,and the collection of gas is strictly controlled by structure.The types of gas pool are mostly partial lenticular.The gas pool has the characteristic of negative anomaly fluid pressure,which has the proper law of distribution.