Pore fluid evolution, distribution and water-rock interactions of carbonate cements in red-bed sandstone reservoirs in the Dongying Depression, China
Pore fluid evolution, distribution and water-rock interactions of carbonate cements in red-bed sandstone reservoirs in the Dongying Depression, China
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东营凹陷红层砂岩储层碳酸盐胶结物孔隙流体演化、分布及水岩相互作用
DOI：
10.1016/j.marpetgeo.2016.02.018
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发表时间：
2016-04
影响因子：
4.2
通讯作者：
Xu Qisong
中科院分区：
文献类型：
--
作者：
Wang Jian;Cao Yingchang;Liu Keyu;Liu Jie;Xue Xiujie;Xu Qisong
孔隙流体的组成、分布及其与岩石的相互作用控制着碳酸盐胶结物的分布和储集空间。采用碳酸盐胶结物岩石学、矿物学、碳氧同位素及流体包裹体等综合分析方法，对东营凹陷红层砂岩储层的储集性能进行了系统研究。通过对碳酸盐胶结物的矿物来源、沉淀机制、孔隙流体演化与分布、水岩作用及其对储层质量的影响等方面的探讨，促进了研究工作的开展。在互层泥岩中的成岩演化流体是方解石胶结物沉淀的主要来源，方解石胶结物用较重的氧和碳同位素完全填充粒间体积（CFIV方解石）。储层砂岩中的铁碳酸盐胶结物富含较轻的碳、氧同位素。除了储层中粘土矿物转化释放的阳离子外，有机酸脱羧产物和相关的长石溶解过程为这种碳酸盐胶结作用提供了重要来源。CO2的碳同位素和与CFIV方解石、铁方解石、白云石和铁白云石胶结物平衡的流体的氧同位素组成表明，红层储层的孔隙经历了高盐度流体的作用，这些流体由早期形成的互层泥岩经有机酸输入和有机酸脱羧作用演化而来。来自附近泥岩的孔隙流体从砂体边缘向中心运移，沿砂体边界沿着形成强烈的方解石胶结，形成致密胶结带。与有机CO2、酸和有机酸脱羧作用有关的孔隙流体主要分布在砂体内部，引起长石溶解和碳酸铁胶结物沉淀。孔隙流体的分布决定了不同时期砂体中碳酸盐胶结物的带状分布。这可能有利于保存储层的孔隙度，如红层砂体中优质储层的分布所示。
The compositions, distribution and its interaction with rocks of the evolving pore fluids controls the distribution of carbonate cements and reservoir storage spaces. The reservoir quality of the red-bed sandstone reservoirs in the Dongying Depression was investigated by an integrated and systematic analysis including carbonate cement petrology, mineralogy, carbon and oxygen isotope ratios and fluid inclusions. The investigation was also facilitated by probing the mineral origins, precipitation mechanisms, pore fluid evolution and distribution, and water-rock interaction of carbonate cements and their influences on reservoir quality. Diagenetic-evolving fluids in the interbedded mudstones are the main source for the precipitation of calcite cements that completely fill the intergranular volume (CFIV calcite) with heavier oxygen and carbon isotopes. The ferro-carbonate cements in the reservoir sandstone are enriched in lighter carbon and oxygen isotopes. In addition to the cations released by the conversion of clay minerals in reservoirs, products of organic acid decarboxylation and the associated feldspar dissolution process provide important sources for such carbonate cementation. The carbon isotopes of CO2and the oxygen isotopic composition of fluids equilibrated with the CFIV calcite, ferro-calcite, dolomite and ankerite cements indicate that the pore in the red-bed reservoirs experienced high salinity fluids, which evolved from the early-formed interbedded mudstones, through organic acid input and to organic acid decarboxylation. Pore fluids from nearby mudstones migrated from the edge to the centre of sandbodies, causing strong calcite cementation along the sandbody boundaries and forming tight cementation zones. Pore fluids associated with organic CO2and acids and organic acid decarboxylation are mainly distributed in the internal portion of sandbodies, causing feldspar dissolution and precipitation of ferro-carbonate cements. The distribution of pore fluids caused the zonal distribution of carbonate cements in sandbodies during different periods. This may be advantageous to preserve the porosity of reservoirs as exemplified by the distribution of high-quality reservoirs in the red-bed sandbodies.
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影响因子：
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作者：
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影响因子：
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作者：
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