鄂尔多斯盆地富县地区长8 致密砂岩成岩差异性及对储层物性的影响
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周家全(1993—),男,山东东营人,在读硕士研究生,从事储层成岩作用研究。联系电话:18505462237,E-mail:zhoujiaquan333@yeah.net。

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国家科技重大专项“深层-超深层油气成藏过程与勘探新领域”(2017ZX05008-004),国家自然科学基金项目“典型致密砂岩天然气运移机理及成藏机制研究”(41372151)。


Diagenetic difference and its influence on reservoir physical properties of Chang8 tight sandstone in Fuxian area,Ordos Basin
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    摘要:

    综合利用岩石薄片、扫描电镜和X射线衍射等方法,以鄂尔多斯盆地南部富县地区三叠系延长组长8致密砂岩储层为研究对象,系统研究储层岩石学特征、物性特征及成岩作用,探讨成岩相的类型和成岩作用差异性对储层物性的影响。结果表明:研究区长8储层主要为极细粒-细粒的长石砂岩,成岩作用复杂且差异性较大。研究区储层主要发育机械压实相、碳酸盐胶结相和弱压实-弱胶结相3种成岩相。其中机械压实相砂岩在成岩早期因机械压实作用变为致密储层,多分布于沉积水动力较弱的砂体中;碳酸盐胶结相砂岩在成岩早期因碳酸盐胶结物大量沉淀而致密化;弱压实-弱胶结相砂岩多分布于分流河道中下部水动力较强的砂体中,由于刚性颗粒含量较高且在成岩早期形成大量绿泥石胶结物,抗压实能力显著提高,同时绿泥石膜在一定程度上抑制了其他类型胶结物的形成,为孔隙流体活动提供了充足的空间,溶蚀作用也较为发育,弱压实-弱胶结相砂岩是研究区相对优质的储层。

    Abstract:

    The Chang8 tight reservoir of Triassic Yanchang Formation in Fuxian area of the southern Ordos Basin was taken as an example to systematically study the reservoir petrology characteristics,reservoir physical characteristics and diagenesis,and to discusses the influence of diagenetic facies types and differential diagenesis on reservoir physical property by thin section observation,scanning electron microscope(SEM)and X-ray diffraction. The results show that the main rock lithology of Chang8 tight reservoir in the study area is ultrafine to fine arkose with complex and different diagenesis. Diagenetic facies of the reservoir can be divided into three types:mechanical compaction diagenetic facies,carbonate cementation diagenetic facies,and weak compaction-weak cementation diagenetic facies. The sand of mechanical compaction diagenetic facies becomes tight reservoir mainly due to the mechanical compaction in the early stage of diagenesis and are mainly distributed in sand bodies with weak hydrodynamics. The sand of carbonate cementation diagenetic facies are densified in the early stage of diagenesis due to the massive precipitation of carbonate cement. The sand of weak compactionweak cementation diagenetic facies are mostly distributed in the sand body with strong hydrodynamics in the middle or lower part of the distributary channel. It has a high content of rigid grains and forms a large amount of chlorite cement in the early stage of diagenesis. Therefore,the ability to resist compaction is significantly improved,and the chlorite membrane inhibits the formation of other types of cement to a certain extent,thereby providing sufficient space for pore fluid activity,resulting in the development of dissolution,which constitutes a relatively high-quality reservoir in the study area.

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周家全,张立强,王香增,贺永红,张立宽,雷裕鸿.鄂尔多斯盆地富县地区长8 致密砂岩成岩差异性及对储层物性的影响[J].油气地质与采收率,2019,26(3):54~62

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  • 在线发布日期: 2019-07-23