鄂尔多斯盆地延安气田山西组二段致密气藏特征与类型分析

来源期刊:中南大学学报(自然科学版)2016年第5期

论文作者:任战利 陈占军 赵靖舟 赵筱艳 高小平 强腾 雷燕云 刘涛

文章页码:1625 - 1637

关键词:伊陕斜坡;山西组二段;致密气;准连续

Key words:Yishan slope; Shan 2 section; tight gas; quasi-continuous

摘    要:对伊陕斜坡东南部延安气田进行研究。研究结果表明:山西组二段储层平面上展布并不稳定,纵向上砂体之间、砂体与围岩之间的空间配置多样;储层物性致密,孔隙度主要分布范围为1.0%~10.0%,渗透率主要介于0.01×10-3~0.40×10-3 μm2之间,层内非均质性与层间非均质程度强;气水分异不明显,未发现气水界面。各砂体之间的气藏特征具有一定程度的差异性,甚至一些井间的砂体可以通过展布方向、井控井距、测井相对比等方法确定其连通,但是其对应的实测气藏压力、含气饱合度、气体组分等并不相同,成藏系统在总体上具有“非统一性”。根据成藏机理分析认为,延安气田山西组二段气藏成藏要素在多阶段的、空间上的非均一性贡献,使致密储层中气水分布的非均一性得以产生、继承、保留,形成了气藏在一些空间域看似“连通”,成藏系统实际却“不统一”的特点。该层段气藏具有三大特征:非均质的致密储层、准连通的圈闭分布和非统一的成藏系统,气藏类型可表征为“准连续型致密砂岩气”。

Abstract: Yan’an gasfield in the southwest of Yishan slope was studied. The results show that the reservoir of section 2 of Shanxi Formation exhibits several characteristics. The reservoir distribution is not stable in plane, and the spatial configurations between sand-bodies, or between sand-body and surrounding rock are various. The reservoir is tight, whose porosity mainly ranges from 1.0% to 10.0% and permeability mainly ranges from 0.01×10-3 μm2 to 0.4×10-3 μm2. Stratification and inner heterogeneity are serious. Differentiation of gas and water is not obvious and the reservoir is lacking in a uniform gas-water interface. There is a certain diversity of gas properties among sand-bodies. Methods of distribution direction of sand, orientation and well spacing, logging facies comparison are used to determine the connectivity of sand-bodies between wells. Some sand-bodies are connected, however, the corresponding measured gasfield pressure, gas saturation and component are different, which means the reservoir forming system is generally not the same. According to reservoir forming mechanism analysis, research concludes that inhomogeneity of hydrocarbon accumulation factors which experienced several stages in section 2 of Yan’an gasfield Shanxi formation, and lead to the gas-water distribution inhomogeneity is produced, inherited and retained. This mechanism and process form a seeming “connectivity” in space domain, but actually the reservoir forming system is “non- uniform”. The gas reservoir layer possesses three characteristics: inhomogeneity tight reservoir, quasi-connectivity trap distribution, non-uniform reservoir system. Thus, the reservoir type can be defined as a “quasi-consecutive tight gas sandstone reservoir”.

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