Characteristics and gas content of the Lower Cambrian dark shale in Well Yuke 1, Southeast Chongqing

Xie Chen; Zhang Jinchuan; Li Yuxi; Wang Xiaohong

doi:10.11743/ogg20130102

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Characteristics and gas content of the Lower Cambrian dark shale in Well Yuke 1, Southeast Chongqing
Vol. 34, Issue 1, Pages: 11-15(2013)
Online First：28 February 2013，

Published：2013
DOI： 10.11743/ogg20130102
稿件说明：

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DOI：

Xie Chen, Zhang Jinchuan, Li Yuxi, et al. Characteristics and gas content of the Lower Cambrian dark shale in Well Yuke 1, Southeast Chongqing[J]. 2013, 34(1): 11-15. DOI： 10.11743/ogg20130102.

摘要

渝东南地区广泛发育下古生界海相页岩

具有发育范围广、厚度大、埋藏深度较浅、有机质丰度高等特点。渝科1井位于四川盆地东南部外缘

揭示了渝东南地区富有机质页岩的发育特征和含气特点。该井钻揭下寒武统牛蹄塘组页岩层总厚50.2 m。研究表明:牛蹄塘组页岩具有有利的页岩气成藏条件

有机碳含量平均值为5.63%

成熟度(R

)主体分布在3%左右。利用测井数据、等温吸附实验、线性回归等多种方法对页岩含气量进行分析和计算

得到牛蹄塘组页岩总含气量在1.0～3.5 m

/t。渝科1井揭示了渝东南地区发育的牛蹄塘组富有机质页岩具有高有机碳含量、高成熟度、高含气量的特点

该地区具有较大的页岩气资源潜力。

Abstract

Lower Paleozoic marine shale is widely distributed in Southeast Chongqing and features in large thickness

shallow burial depth and high organic abundance.The information from Well Yuke 1 helps us to well understand the characteristics and gas potential of the dark shale.The thickness of dark shale in the Cambrian Niutitang Formation is 50.2 m in total.Our studies reveal that the shale has favorable hydrocarbon accumulation conditions

with an average total organic carbon content(TOC) of 5.63% and an average vitrinite reflectance(R

) of 3%.Calculation through logging analysis

isothermal adsorption test and linear regression shows that the total gas content of the shale is within the range of 1.0-3.5 m

/t.Well Yuke 1 demonstrates that the Niutitang Formation dark shale is characterized by high organic content

high maturity and large gas content

indicating great potential of shale gas resources.