天然气地质学

成岩作用对储层物性的影响及与沉积环境的关系——以鄂尔多斯盆地劳山地区为例

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  • (大庆油田有限责任公司勘探开发研究院,黑龙江 大庆 163712)

收稿日期: 2007-11-02

  修回日期: 2008-03-06

  网络出版日期: 2008-04-10

Affection of Diagenesis on Reservoir Properties and itsRelationship with Depositional Setting:A Case from UpperTriassic Yanchang Formation Sandstones, Laoshan

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  • (Exploration and Development Research Institute, Daqing Oilfield Company, Daqing 163712, China)

Received date: 2007-11-02

  Revised date: 2008-03-06

  Online published: 2008-04-10

摘要

长2和长6油层组砂岩是鄂尔多斯盆地劳山地区三叠系延长组非常重要的储层。为了解长2和长6油层组成岩作用及其对储层物性的影响,进行了详细的岩心描述,薄片观察和扫描电镜分析并指出:研究区成岩作用类型主要是压实作用和胶结作用,其次为溶蚀作用和交代蚀变作用,其中压实作用和胶结作用是造成该区储层物性降低的主要因素,而溶蚀作用常使储层物性得以改善;成岩作用与沉积环境有很好的对应关系,不同环境下形成的岩石物性有明显差异,长2油层组主要为河流相沉积,长6油层组主要为三角洲相沉积,前者物性明显好于后者,因为河流相水动力条件一般比三角洲相强,形成的砂岩的颗粒粒度较大,杂基含量较少,相对于后者,前者在成岩作用过程中埋深较浅,压实作用相对较弱,后期溶蚀作用较强。

本文引用格式

王卓卓;梁江平;李国会;施立志 . 成岩作用对储层物性的影响及与沉积环境的关系——以鄂尔多斯盆地劳山地区为例[J]. 天然气地球科学, 2008 , 19(2) : 171 -177 . DOI: 10.11764/j.issn.1672-1926.2008.02.171

Abstract

The Chang 2 and Chang 6 sandstones are important Triassic reservoirs in the Laoshan area. Detailed core description, petrography and SEM microscopy studies were conducted to describe the petrographic features and diagenetic patterns of these sandstones. These sandstones are generally fine\|grained, and are mainly composed of feldspathic sandstones, with subordinate litho\|feldspathic sandstones and feldspathic quartzose sandstones. Observations indicate that the more brittle components, i.e., quartz, the sandstones have, the better their petrophysical properties are. It is also found that the quality of the reservoirs is generally positively correlated with the grain size of sandstones. During burial, these sandstones suffered substantial compaction dissolution and cementation. Compaction and carbonate cementation were the major processes that reduced the porosity of the reservoirs. By the contrast, dissolution resulted in the increase of the porosity, which generally improved the reservoir quality. Chang 2 is mainly fluvial facies, while Chang 6 is delta facies. Chang2’s physical properties are obviously better than Chang 6 because the fluvial facies’ hydrodynamic force is stronger than delta facies. The fluvial facies sandstone grain is bigger and matrix is lower than the delta facies. Chang 2 is buried lower and its compaction is stronger, but the dissolution in the latter is stronger so its physical properties are better.

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