龙门山北段中坝气田须家河组三段油气地质条件  

Evaluation on Oil and Gas Geological Conditions of Xujiahe 3 Member, Zhongba Gasfield, Northern Longmenshan Mountains

作　　者：刘柏[1] 陈代富[1] 张本健[1] 杨华[1] 孙志昀 谢格云 杜江[1] 杨敏[1] 

机构地区：[1]中国石油西南油气田公司川西北气矿,四川江油621709

出　　处：《天然气技术与经济》2017年第1期8-11,共4页Natural Gas Technology and Economy

摘　　要：1972年发现的中坝气田已进入开发后期,有必要寻找新的接替层系。为此,在前人研究的基础上,对须家河组三段油气地质条件进行分析。研究表明,须家河组三段存在页岩气与致密砂岩气两类气藏:页岩气藏中有效页岩厚度大、分布稳定,且生气强度大;致密砂岩气藏的储集层为以晶间孔+溶蚀孔+裂缝组合为储集空间的水下分流河道砂体、河口坝砂体,储集砂体与烃源岩大面积直接接触,为自生自储气藏,同时须家河组一段生成的部分油气通过断层垂向运移至须家河组三段聚集成藏。综合分析认为,中坝地区须家河组三段气藏源、储、盖匹配程度高,烃源丰富,勘探潜力较大,是继须家河组二段、雷口坡组三段之后另一个重要的勘探层系。Zhongba gasfield, discovered in 1972, has entered into the later development stage. It's necessary to explore new replacement strata. So, based on previous study, the oil and gas geological conditions of Xujiahe 3 Member were analyzed. Results show that(1) there are two kinds of gas reservoirs including shalegas ones and tight sandstone gas ones;(2) for the shale-gas reservoirs, the effective shale is featured by large thickness, stable distribution, and big gas-generating capacity; and(3) for the tight sandstone gas reservoirs, which are composed of underwater ditributary channel, mouth bar sandbody, and reservoir sandbody with the assembly of intercrystalline pore, dissolution pore and fracture as the reservoir space, they connect with large-scale source rock and belong to self-generating and self-preserving ones. Furthermore, partoil and gas generated from Xujiahe 1 Member migrated vertically to Xujiahe 3 Member. Our study demonstrates that in Zhongba area,the Xujiahe 3 Member has the better association of source, reservoir, and caprock; and there is a plenty of source rock with large exploration potential. So, this member should be another important exploration stratum since Xujiahe 2 Member and Leikoupo 3 Member.

关 键 词：须家河组 油气地质条件 中坝气田 自生自储 龙门山北段 

分 类 号：P618.13[天文地球—矿床学]