东营凹陷胜三区浅层天然气藏类型、分布及控制因素

The type, distribution and controlling factors of the shallow gas-pool in the Block Sheng 3, Dongying sag, Shengli Oilfield in eastern China

以东营凹陷胜坨地区的胜三区浅层天然气藏为例 ,分析浅层天然气藏的基本特征、类型、分布及成藏控制因素。该区浅层天然气藏类型主要有构造型、断层 构造复合型及岩性型 ,从沙河街组至明化镇组 ,依次出现油藏—油气藏—气藏序列 ;与断层有关的复合圈闭形成的气藏往往规模较大 ,构造圈闭次之 ,岩性圈闭大多形成规模较小的“气土豆” ,其分布主要受沉积微相控制。气源条件、断层的分布以及圈闭要素的有利组合是形成一定规模气藏的必要条件。图 3表 1参

The basic characters, type, distribution and major controlling factors of the shallow gas pools in the Block Sheng 3, Dongying sag of the Shengli Oilfield in eastern China are characteristic of a shallow gas pool. The gas pools in this area are mainly controlled by stratigaphic structure, fault structure and lithologic type. The sequence of oil oil/gas gas reservoir formed successively from the Shahejie to Minghuazhen formations of Neocene age. Combined traps related with faults have a larger scale, then structurally formed ones. In most cases, 'gas potato' could be discovered within the lithologic traps, and their distribution is probably controlled mainly by sedimentary micro facies. A better combination between the conditions of gas source, fault and trapping should be the key for forming the commercial gas pools.