| 致密砂岩储层不同成岩作用对孔隙度定量演化的影响：以鄂尔多斯盆地姬塬油田长6储层为例 |
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| 引用本文： | 黎盼,孙卫,杜堃,黄何鑫,白云云.致密砂岩储层不同成岩作用对孔隙度定量演化的影响：以鄂尔多斯盆地姬塬油田长6储层为例[J].现代地质,2018,32(3):527. |
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| 作者姓名： | 黎盼 孙卫 杜堃 黄何鑫 白云云 |
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| 作者单位： | 西北大学 大陆动力学国家重点实验室/地质学系，陕西 西安710069 |
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| 基金项目： | 国家科技重大专项“大型油气田及煤层气开发”(2011ZX05044)；陕西省科技统筹创新工程项目(2015KTCL01-09)；陕西省教育厅专项科研计划项目(15JK1063)。 |
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| 摘 要： | 鄂尔多斯盆地姬塬油田长6储层压实作用和成岩作用强烈，储层的强非均质性制约了油气勘探效益的提高。通过开展常规物性、图像粒度、铸体薄片、X衍射、扫描电镜、高压压汞和恒速压汞等实验研究储层的微观特征，以时间为主轴，综合沉积环境、埋藏深度、古地温、构造等因素，采用“成岩演化特征”和“地质综合效应”相结合的方法建立了姬塬油田长6致密砂岩储层的孔隙度演化模拟方程，分析了致密砂岩储层成岩作用、孔隙演化等的成因机理。孔隙度演化计算结果表明姬塬油田长6段致密砂岩储层初始孔隙度为3733%，压实作用损失的孔隙度为2247%，早期胶结-交代损失的孔隙度为369%，产生的次生孔隙度为653%，中晚期胶结-交代过程孔隙度损失平均值为697%，计算孔隙度平均值为1006%。致密砂岩储层的差异性成岩演化过程是导致储层物性和微观孔隙结构差异的根本原因。
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| 关 键 词： | 姬塬油田 长6储层 致密砂岩 差异性成岩 孔隙度演化 |
Effect of Differential Diagenesis on the Quantitative Evolution of Porosity
in Tight Sandstone Reservoirs: Taking the Chang 6 Reservoir
of the Jiyuan Oilfield in Ordos Basin as An Example |
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| LI Pan,SUN Wei,DU Kun,HUANG Hexin,BAI Yunyun.Effect of Differential Diagenesis on the Quantitative Evolution of Porosity
in Tight Sandstone Reservoirs: Taking the Chang 6 Reservoir
of the Jiyuan Oilfield in Ordos Basin as An Example[J].Geoscience——Journal of Graduate School,China University of Geosciences,2018,32(3):527. |
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| Authors: | LI Pan SUN Wei DU Kun HUANG Hexin BAI Yunyun |
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| Institution: | State Key Laboratory for Continental Dynamics, Department of Geology，Northwest University，Xi'an，Shaanxi710069，China |
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| Abstract: | In the Ordos Basin, the effects of compaction and diagenesis are strong in the Chang 6 reservoir of the Jiyuan Oilfield, and the great heterogeneity has limited the oil and gas development. This paper first studied the microscopic characteristics of the reservoir via microcosmic experiments including conventional physical properties, image granularity, casting lamella, X ray diffraction, high pressure mercury injection, constant speed mercury injection and SEM. Taking time as the main factor and integrating with the depositional environment, burial depth, paleotemperature, tectonism and other minor factors, we established the porosity evolution simulation equations of tight sandstone reservoir at Chang 6 by using the diagenetic evolution characteristics and geological comprehensive effects. We analyzed the formation mechanism of the diagenesis effect and porosity evolution in tight sandstone reservoirs. Computing results of porosity evolution show that the initial porosity of the Chang 6 reservoir was 3733%, the porosity loss by compaction effect was 2247%, porosity loss by early phase cement metasomatism was 369%, secondary porosity was 653%, the porosity loss by middle and late phase cement metasomatism was 697%, and the porosity was 1006% on average. We suggest that the differential diagenetic evolution process of tight sandstone reservoir is the fundamental cause of the physical property differences and micro pore structures. |
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| Keywords: | Jiyuan Oilfield Chang 6 reservoir tight sandstone differential diagenesis porosity evolution |
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