Reservoir characteristics and evaluation on logging of the Lower Cambrian gas shale in southeast Chongqing：a case study of Well Yuke 1 and Well Youke 1

doi:10.7623/syxb201402003

ACTA PETROLEI SINICA ›› 2014, Vol. 35 ›› Issue (2): 233-244.DOI: 10.7623/syxb201402003

• Petroleum Exploration • Previous Articles Next Articles

Reservoir characteristics and evaluation on logging of the Lower Cambrian gas shale in southeast Chongqing：a case study of Well Yuke 1 and Well Youke 1

Cao Xiaomeng¹, Yu Bingsong¹, Li Xintong², Sun Mengdi¹, Zhang Ling³

1. School of Geosciences and Resources, China University of Geosciences, Beijing 100083, China;
2. School of Geosciences, University of Edinburgh, Edinburgh EH9 3JG, UK;
3. Wireline Logging Company of Daqing Drilling & Exploration Engineering Corporation, Daqing 163412, China

Received:2013-10-16 Revised:2014-01-22 Online:2014-03-25 Published:2014-04-11

渝东南下寒武统页岩储层特征及测井评价——以渝科1井和酉科1井为例

曹晓萌¹, 于炳松¹, 李心童², 孙梦迪¹, 张玲³

1. 中国地质大学地球科学与资源学院北京 100083;
2. 英国爱丁堡大学地球科学学院爱丁堡 EH9 3JG;
3. 大庆钻探工程公司测井公司黑龙江大庆 163412

通讯作者: 于炳松，男，1962年11月生，1982年毕业于浙江煤炭工业学校，1994年获中国地质大学（北京）博士学位，现为中国地质大学（北京）教授、博士生导师，主要从事储层地质学、含油气盆地分析、地球化学方面的研究。Email：yubs@cugb.edu.cn
作者简介:曹晓萌，女，1990年10月生，2012年获中国地质大学（北京）地质学学士学位，现为中国地质大学（北京）矿物学、岩石学、矿床学专业硕士研究生，主要从事沉积学方面的研究。Email：229590347@qq.com
基金资助:
高等学校博士学科点专项科研基金优先发展领域课题“中国南方海相富有机质页岩天然气吸附机理与储气性能研究”（20120022130001）和国土资源部全国页岩气资源战略调查项目（2009GYXQ15-04）资助。

Abstract

Abstract:

To correctly recognize reservoir characteristics and their controlling factors of the Lower Cambrian black shales of Niutitang Formation in southeast Chongqing, the following tests are systematically performed on the core samples collected from Well Yuke 1 and Well Youke 1, including clay minerals and whole rock X-rays diffraction analysis, and analyses on common petrophysical properties, pore size and specific surface area, organic carbon in rock, vitrinite reflectance (R_o) and maceral composition. The test results show that the average content of detrital minerals and clay minerals in the shale reservoirs of Niutitang Formation is 51.34% and 32.74%, and the average effective porosity and permeability is 1.2% and 8.0×10^-3 mD respectively, demonstrating these reservoirs are of ultra-low porosity and permeability. Moreover, mesopores as the main type account for 73% of the total pore volume. The average BET (Brunauer, Emmett and Teller) specific surface area is 7.75 m²/g, and the pore diameter is 5.3 nm; the total content of organic carbon (TOC) has an average of 2.29%, and the average R_o is 3.12%, indicating that the shale reservoirs are in the over-mature stage. Further statistical analysis shows that TOC is positively correlated with micropore volume, while the total content of clay minerals is negatively correlated with it; TOC, the total content of clay minerals and the content of carbonate minerals are positively correlated with mesopore volume; TOC and the content of carbonate minerals are positively correlated with macropore volume, and the content of detrital minerals has weakly positiue Correlation with it, whereas the total content of clay minerals is negatively correlated with it. The TOC and porosity of shales in Niutitang Formation are calculated using conventional logging method. It is discovered that the porosity calculated according to the neutron curve fits well with core analysis results in both Well Yuke 1 and Well Youke 1. However, in the shallow layers without gas and oil, gamma-ray curve has no obvious correlation with TOC obtained by core analysis.

Key words: shale, reservoir characteristics, multiple linear regression, Niutitang Formation, Well Yuke 1

摘要：

为了正确认识渝东南地区下寒武统牛蹄塘组黑色页岩储层特征与主控因素，对采自渝科1井和酉科1井的岩心样品，进行了系统的黏土矿物及全岩X-射线衍射分析、岩石常规物性分析、比表面和孔径分析、岩石有机碳分析、镜质体反射率（R_o）及显微组分测试。测试分析结果表明：牛蹄塘组页岩储层碎屑矿物含量平均为51.34%，黏土矿物含量平均为32.74%，有效孔隙度平均为1.2%，渗透率平均为8.0×10^-3mD，属于特低孔、特低渗储层。孔隙以中孔为主，约占总孔体积的73% 。BET（Brunauer、Emmett和Teller）比表面积平均为7.75 m²/g，平均孔直径为5.3 nm。总有机碳含量（TOC）平均为2.29%，R_o平均为3.12%，属于过成熟阶段。进一步统计分析表明：TOC与微孔体积呈正相关，黏土矿物总量与之呈负相关；TOC、黏土矿物总量、碳酸盐矿物含量均与中孔体积呈正相关；TOC、碳酸盐矿物含量均与宏孔体积呈正相关，碎屑矿物含量与之呈弱的正相关，黏土矿物总量与之呈负相关。用常规测井方法对牛蹄塘组页岩的孔隙度和TOC进行了计算，发现利用中子曲线计算的孔隙度与岩心分析结果在两口井中均吻合较好，但浅层不含油气情况下，自然伽马曲线（GR）与岩心分析TOC之间无明显相关关系。

关键词: 页岩, 储层特征, 多元线性回归, 牛蹄塘组, 渝科1井

CLC Number:

P631.8

Cao Xiaomeng, Yu Bingsong, Li Xintong, Sun Mengdi, Zhang Ling. Reservoir characteristics and evaluation on logging of the Lower Cambrian gas shale in southeast Chongqing：a case study of Well Yuke 1 and Well Youke 1[J]. ACTA PETROLEI SINICA, 2014, 35(2): 233-244.

曹晓萌, 于炳松, 李心童, 孙梦迪, 张玲. 渝东南下寒武统页岩储层特征及测井评价——以渝科1井和酉科1井为例[J]. 石油学报, 2014, 35(2): 233-244.

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Reservoir characteristics and evaluation on logging of the Lower Cambrian gas shale in southeast Chongqing：a case study of Well Yuke 1 and Well Youke 1

渝东南下寒武统页岩储层特征及测井评价——以渝科1井和酉科1井为例

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