柴达木盆地英西地区E32碳酸盐岩沉积演化特征

doi:10.12108/yxyqc.20190206

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (2): 46–55.doi: 10.12108/yxyqc.20190206

柴达木盆地英西地区E₃²碳酸盐岩沉积演化特征

易定红¹, 王建功^1,2, 石兰亭¹, 王鹏³, 陈娟¹, 孙松领¹, 石亚军^1,2, 司丹³

1. 中国石油勘探开发研究院西北分院, 兰州 730020;
2. 中国石油集团油藏描述重点实验室, 兰州 730020;
3. 中国石油青海油田分公司, 甘肃敦煌 736200

收稿日期:2018-08-15 修回日期:2018-11-03 出版日期:2019-03-21 发布日期:2019-03-21
第一作者:易定红(1975-),男,硕士,高级工程师,主要从事储层沉积学与石油地质学方面的科研工作。地址:(730020)甘肃省兰州市城关区雁儿湾路535号。Email:yidh@petrochina.com.cn。
基金资助:
中国石油天然气股份有限公司重大科技专项“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”（编号：2016E-01）和国家重大科技专项“柴达木复杂构造区油气成藏、关键勘探技术与新领域目标优选”（编号：2016ZX05003-006）联合资助

Sedimentary evolution characteristics of E₃² carbonate rocks in Yingxi area,Qaidam Basin

YI Dinghong¹, WANG Jiangong^1,2, SHI Lanting¹, WANG Peng³, CHEN Juan¹, SUN Songling¹, SHI Yajun^1,2, SI Dan³

1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
2. Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China;
3. PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China

Received:2018-08-15 Revised:2018-11-03 Online:2019-03-21 Published:2019-03-21

摘要/Abstract

摘要： 近年来，柴达木盆地英西地区古近系渐新统下干柴沟组上段（E₃²）湖相碳酸盐岩油气勘探获得了重大突破，并展现出亿吨级储量规模。为了进一步评价油气勘探目标，通过岩心观察和钻、测井资料分析，根据MnO/Fe，Sr/Ba，碳氧同位素等地球化学参数和岩石薄片鉴定结果，对湖相碳酸盐岩的沉积演化特征进行了研究。结果表明：英西地区碳酸盐岩主要发育在E₃²的下部和中部，与膏盐岩或陆源碎屑岩相间发育；主要分布在湖盆的沉积中心，往盆地边缘方向变薄并相变为陆源碎屑岩或膏盐岩；是混合沉积成因，矿物成分复杂、岩性多样；形成于干旱气候条件下封闭的咸化水体介质环境，水体盐度是其岩性变化和发育程度的主要控制因素。该认识为落实英西地区的储量规模提供了地质依据。

关键词: 碳酸盐岩, 沉积环境与演化, 咸化湖盆, 下干柴沟组上段, 英西地区

Abstract: In recent years,great breakthroughs have been made in oil and gas exploration of lacustrine carbonate rocks in the upper member of Xiaganchaigou Formation (E₃²) of the Paleogene Oligocene in Yingxi area of Qaidam Basin,showing a reserves scale of 100 million tons. In order to evaluate next hydrocarbon exploration targets in Yingxi area,based on core observation and analysis of drilling and logging data,combined with geochemical parameters such as MnO/Fe,Sr/Ba,carbon and oxygen isotopes and thin section identification,the sedimentary evolution characteristics of lacustrine carbonate rocks were studied. The results show that carbonate rocks in Yingxi area mainly developed in the lower and middle part of E₃²,which interbedded with gypsum-salt rocks or terrigenous clastic rocks and mainly distributed in the sedimentary center of lacustrine basin,thinning towards the margin of the basin and transforming into terrigenous clastic rocks or gypsum-salt rocks. The carbonate rocks in Yingxi area were characterized by mixed sedimentary origin,complex mineral composition and diverse lithology,and formed in closed saline water environment under arid climate,and water salinity is the main controlling factor of lithological change and development degree. This research can provide a geological basis for defining the reserves scale in Yingxi area.

Key words: carbonate rock, sedimentary environment and evolution, saline lacustrine basin, upper member of Xiaganchaigou Formation, Yingxi area

中图分类号:

TE122

易定红, 王建功, 石兰亭, 王鹏, 陈娟, 孙松领, 石亚军, 司丹. 柴达木盆地英西地区E₃²碳酸盐岩沉积演化特征[J]. 岩性油气藏, 2019, 31(2): 46–55.

YI Dinghong, WANG Jiangong, SHI Lanting, WANG Peng, CHEN Juan, SUN Songling, SHI Yajun, SI Dan. Sedimentary evolution characteristics of E₃² carbonate rocks in Yingxi area,Qaidam Basin[J]. Lithologic Reservoirs, 2019, 31(2): 46–55.

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柴达木盆地英西地区E₃²碳酸盐岩沉积演化特征

Sedimentary evolution characteristics of E₃² carbonate rocks in Yingxi area,Qaidam Basin

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