Diagenesis fluid stagnation effect and genesis of tight sandstone reservoir in Yanchang Formation,Ordos Basin

doi:10.7623/syxb201808002

Acta Petrolei Sinica ›› 2018, Vol. 39 ›› Issue (8): 858-868.DOI: 10.7623/syxb201808002

• Petroleum Exploration • Previous Articles Next Articles

Diagenesis fluid stagnation effect and genesis of tight sandstone reservoir in Yanchang Formation,Ordos Basin

Wei Xinshan^1,2, Fu Qiang³, Dan Weidong^1,2, Zhao Shijie³, Pang Jinlian^1,2, Chu Meijuan^1,2

1. Exploration and Development Institute, PetroChina Changqing Oilfield Company, Shannxi Xi'an 710018, China;
2. National Engineering Laboratory for Exploration & Development of Low-Permeability Oil & Gas Fields, Shaanxi Xi'an 710018, China;
3. School of Ocean and Earth Science, Tongji University;Key State Laboratory of Marine Geology, Shanghai 200092, China

Received:2017-10-27 Revised:2018-03-30 Online:2018-08-25 Published:2018-09-04

鄂尔多斯盆地延长组成岩流体滞留效应与致密砂岩储层成因

魏新善^1,2, 傅强³, 淡卫东^1,2, 赵世杰³, 庞锦莲^1,2, 楚美娟^1,2

1. 中国石油长庆油田公司勘探开发研究院陕西西安 710018;
2. 低渗透油气田勘探开发国家工程实验室陕西西安 710018;
3. 同济大学海洋与地球科学学院海洋地质国家重点实验室上海 200092

通讯作者: 傅强,男,1964年10月生,1986年获成都地质学院学士学位,1997年获成都地质学院博士学位,现为同济大学海洋与地球科学学院教授、博士生导师,主要从事石油天然气地质综合研究及储层研究相关工作。Email:fuqiang@tongji.edu.cn
作者简介:魏新善,男,1962年8月生,1983年获西北大学学士学位,1996年获成都地质学院博士学位,现为中国石油长庆油田公司勘探开发研究院高级工程师,主要从事鄂尔多斯盆地天然气勘探生产和综合地质研究工作。Email:wxs_cq@petrochina.com.cn
基金资助:
国家科技重大专项（2016ZX05050，2016ZX05046）资助。

Abstract

Abstract:

The sandstone reservoir of the Upper Triassic Yanchang Formation in Ordos Basin is mainly a low-permeability tight reservoir. The gentle tectonic setting, the difference in the content and type of reservoir cement, the homogenization temperature of inclusions, the carbon-oxygen isotope analysis of carbonate cements and formation water characteristics prove the stagnation effect in the diagenetic fluids of sandstone reservoirs, Upper Triassic Yanchang Formation, Ordos Basin. Although the detrital mineral particles are eroded by the organic acids excreted during the hydrocarbon generation of source rocks, due to the gentle formation, the diagenetic fluid is difficult to migrate and remains in the original pores to form a large amount of autogenous cement precipitation. The porosity evolution calculation shows that the pore-reducing effect of diagenetic compaction is the main cause of tight sandstone reservoirs in Yanchang Formation. Moreover, the development of authigenic clay minerals and carbonate cements in sandstone reservoirs of Yanchang Formation is caused by the stagnation effect of diagenetic fluids. Therefore, the induced strong cementation is also the main reason for forming tight reservoir with strong oil-bearing heterogeneity effect. Meanwhile, the pore-reducing effect is almost the same as diagenetic compaction.

Key words: Ordos Basin, Upper Triassic, Yanchang Formation, tight reservoir, fluid stagnation effect

摘要：

鄂尔多斯盆地上三叠统延长组砂岩储层主要是致密低渗透储层。平缓的构造背景、储层胶结物含量及类型的差异、包裹体均一温度、碳酸盐胶结物碳氧同位素分析及地层水特征均证明，鄂尔多斯盆地上三叠统延长组砂岩储层中成岩流体存在滞留效应。尽管碎屑矿物颗粒被烃源岩生烃过程中排出的有机酸溶蚀，但由于地层平缓、成岩流体难以迁移而滞留在原来的孔隙中，形成了大量自生胶结物沉淀。孔隙度演化计算表明，除成岩压实减孔作用是导致延长组砂岩储层致密的主要因素外，成岩流体滞留效应造成延长组砂岩储层中自生黏土矿物和碳酸盐等胶结物发育，由此导致的强胶结效应是储层致密、强含油非均质性的主要原因，且其减孔作用与成岩压实作用几乎相同。

关键词: 鄂尔多斯盆地, 上三叠统, 延长组, 致密储层, 流体滞留效应

CLC Number:

TE122.2

Wei Xinshan, Fu Qiang, Dan Weidong, Zhao Shijie, Pang Jinlian, Chu Meijuan. Diagenesis fluid stagnation effect and genesis of tight sandstone reservoir in Yanchang Formation,Ordos Basin[J]. Acta Petrolei Sinica, 2018, 39(8): 858-868.

魏新善, 傅强, 淡卫东, 赵世杰, 庞锦莲, 楚美娟. 鄂尔多斯盆地延长组成岩流体滞留效应与致密砂岩储层成因[J]. 石油学报, 2018, 39(8): 858-868.

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WANG Jianmin,WANG Jiayuan.Low-amplitude structures and oil-gas enrichment on the Yishaan slope,Ordos Basin[J].Petroleum Exploration and Development,2013,40(1):49-58.

Diagenesis fluid stagnation effect and genesis of tight sandstone reservoir in Yanchang Formation,Ordos Basin

鄂尔多斯盆地延长组成岩流体滞留效应与致密砂岩储层成因

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