| 自生粘土矿物对文昌A凹陷深部储层的制约 |
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| 引用本文： | 袁晓蔷,姚光庆,杨香华,尤丽,陆江.自生粘土矿物对文昌A凹陷深部储层的制约[J].地球科学,2019,44(3):909-918. |
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| 作者姓名： | 袁晓蔷 姚光庆 杨香华 尤丽 陆江 |
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| 作者单位： | 1.中国地质大学资源学院, 武汉 430074 |
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| 基金项目： | 国家"十三五"油气重大专项2016ZX05024-006 |
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| 摘 要： | 目前关于自生粘土矿物对深层孔隙结构及油气运聚的影响方面的研究十分薄弱.综合利用铸体薄片、全岩XRD、扫描电镜、恒速压汞等测试手段，分析自生粘土矿物对孔隙连通性、孔喉直径及其分布的影响，并结合埋藏史和生烃史探讨了低渗透砂岩不同孔隙结构类型的油气差异富集条件.珠海组深部储层压实作用较强，自生粘土矿物含量较高.碎屑颗粒以线接触-凹凸接触为主，识别出"孔隙+粗喉道"和"喉道主控"2种孔隙结构类型，前者孔隙体积和粗喉道占比较高，后者主要以细喉道为主；自生粘土矿物分割占据大量孔喉空间，自生伊利石主要为孔喉充填型，自生绿泥石主要为颗粒包壳型；珠海组储层与下渐新统恩平组烃源岩不整合接触形成纵向"下生上储"、横向连续分布的有利源储组合，烃源岩持续生烃.珠海组是典型的深埋藏碎屑岩低渗储层，仍具备良好的储集条件，储层发育受机械压实作用和自生粘土矿物共同控制；压实作用是原生孔隙损失的初始因素，以绿泥石和伊利石为代表的自生粘土矿物高度发育是制约优质储层发育的关键因素.
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| 关 键 词： | 文昌A凹陷 珠海组 低渗储层 形成机理 油气富集 石油地质 |
| 收稿时间： | 2018-11-07 |
Constraints of Authigenic Clay Minerals on Deep Reservoirs in Wenchang A Sag |
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| Abstract: | The research on the impacts of authigenic clay minerals on pore throat structure and hydrocarbon migration and accumulation is very weak.In this study, impacts of authigenic clay on pore connectivity, pore-throat size and its distribution were investigated for the resulting impacts on hydrocarbon accumulation and percolation in order to find out the genetic mechanism of tight sandstones in Oligocene Zhuhai Formation of Wenchang A Sag, Pearl River Mouth Basin.Thin slice identification, whole rock X-ray diffraction analysis, scanning electron microscopy and rate-controlled mercury injection were employed to characterize authigenic clay and its physical property.Source-reservoir assemblages were studied based on burial history and hydrocarbon-generating history of underlying source rocks.Two types were distinguished as "pore combined with throat" and "fine diameter throat-controlling".The former contains more interparticle pores and thick throat, while the latter contains mainly narrow throat.Mechanical compaction led to primary porosity lost and authigenic clay-related pores gradually played a significant role in controlling pore structure of tight sandstone reservoirs.There is very little difference in porosity and wide distribution in permeability between the two pore structure types.The unconformity contact between reservoirs and source rocks forms a favorable source-storage combination for lateral continuous distribution, and the source rocks have been generating hydrocarbon constantly.Mechanical compaction and authigenic clay are considered to be control factors affecting reservoir property and hydrocarbon enrichment for the following reasons:the pore structure and permeability are chiefly controlled by fine diameter of pore and throat as well as complex relation between pore and throat, the underlying source rocks have been providing constant driving force and hydrocarbon supply.Zhuhai Formation serves a representative example for deep buried tight sandstone reservoir. |
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