收稿日期: 2011-11-17
修回日期: 2011-11-30
网络出版日期: 2011-12-10
Geological Conditions of Upper Paleozoic Shan-2 Gas Reservoir in Southeastern Ordos Basin
Received date: 2011-11-17
Revised date: 2011-11-30
Online published: 2011-12-10
鄂尔多斯盆地东南部具有很好的天然气成藏条件，勘探潜力较大，尤其是山2气藏，其成藏条件具有烃源岩成熟度高，分布范围广；储层致密，非均质强；盖层保存条件良好等特点。在烃源岩地球化学参数分析\,生烃强度计算\,储层特征参数分析\,铸体薄片观察及盖层研究的基础上，总结研究区气藏形成条件：烃源岩条件良好，盖层封盖性强\.在这些条件下，气藏的形成则更多取决于储层发育程度。（微）裂缝的存在有利于提高储层的基质渗透率，从而形成优质储层，对优质储层影响因素的研究将是在研究区寻找富集高产区的关键，认为：①优质储层的形成首先要有大段的厚层砂体，对于山2气藏来说就是河道砂，平面上大面积分布，连续性好;②石英砂岩比岩屑砂岩更容易产生（微）裂缝，从而改善储层，提高天然气产量。
陈莹, 曹青, 刘鹏, 刘研言 . 鄂尔多斯盆地东南部上古生界山2气藏形成地质条件分析[J]. 天然气地球科学, 2011 , 22(6) : 969 -974 . DOI: 10.11764/j.issn.1672-1926.2011.06.969
Geological conditions of gas accumulation in the southeastern Ordos basin are favorable to become a potential area of gas exploration,especially for Shan-2 gas reservoir,since there are highly mature and widely distributed source rock,tight sandstone reservoir with serious heterogeneity,and good sealing condition. Based on geochemical parameters of source rock,hydrocarbon generation intensity,reservoir properties,casting thin sections observation,and seal condition,we conclude the geological conditions of gas accumulation,suggesting that both source rock and sealing condition are good. Thus,the gas accumulation is greatly related to reservoir features. Micro-fracture reservoir is good at improving the matrix permeability. The factor of high quality reservoir is the key to look for the areas of the enriched gas accumulation. We consider that (1) The formation of high quality reservoir need have a large segment of the thick sand layer,the Shan2 reservoir as a channel sand has wide distribution and good continuity; (2) Quartz sandstone is more easily to produce micro-fracture than that of feldspathic sandstone so that it can improve the quality of gas reservoir and gas production.
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