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Identification and characteristic analysis of carbonate cap rock: A case study from the Lower-Middle Ordovician Yingshan Formation in Tahe oilfield, Tarim Basin, China
  • 2024-01-08
元数据
名   称 Identification and characteristic analysis of carbonate cap rock: A case study from the Lower-Middle Ordovician Yingshan Formation in Tahe oilfield, Tarim Basin, China
科技资源标识 CSTR:11738.14.NCDC.XDA14.PP5772.2024
DOI 10.1016/j.petrol.2017.12.070
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摘   要 Accurate description of heterogeneous distribution and complex sealing capacity of carbonate cap rock is essential for prospecting carbonate reservoirs. Based on core and thin sections, well drilling, fullbore microscan imaging (FMI) and conventional logs, qualitative and quantitative identifications of cap rock were performed within the Yingshan Formation (O1-2y) in Tahe oilfield. Porosity and permeability measurements, scanning electron microscope (SEM) analysis, and displacement pressure calculations were used to characterize the reservoir-cap assemblages. After calibration based on cores and wireline logs, four recognition patterns of cap rock, including blocky-bearing, layered-bearing, porphyritic-bearing and linear-bearing, are developed on FMI. Four sensitive logging parameters (deep-shallow dual lateral resistivity (RD-RS), natural gamma ray (GR), caliper (CAL)) were chosen to construct the quantitative identification criteria, with the higher value being RD-RS ≥ 1000
 
and lower being GR ≤ 15 API. Four lithologic types and eleven subtypes were identified in carbonate cap rock, and micrite was dominant lithology. The cap rock is characterized by low porosity ranging from 0.04 to 1.4% (averaging 0.568%) and low permeability ranging from
to
(averaging
). Five sets of cap rock have a significant bottom-up difference in diverse members, and the thickness of individual cap rock ranges from several meters to tens of meters. The stability parameter (S) was adopted to reflect the distribution differences, and superior cap rock defined as the Order I (S > 3.84) occurs in the middle part of the 3rd member. Capillary seals control the sealing capacity, and the displacement pressure difference of effective sealing among the cap rock and underlying oil-bearing intervals should be 3 MPa and higher. Strong vertically superimposed and poor laterally connected direct carbonate cap rock plays a decisive role in controlling hydrocarbon preservation and production of carbonate reservoirs.
学科分类
170.50
关键词
Carbonate cap rockRecognition patternsSealing capacityYingshan Formation
作者 Jun Wu,Tailiang Fan,Zhiqian Gao,Yu Gu,Jiabei Wang,Yang Du,Chen Li,Shanshan Wang,Chenjia Zhang,Miaomiao Meng,Duan Wei,Hua Fan
数据量 15.2 MiB
论文类型： journal
论文网址： https://www.sciencedirect.com/science/article/pii/S0920410517310276
期刊名称： Journal of Petroleum Science and Engineering
出版时间： 2018-05-01
引用和标注
数据引用
Jun Wu,Tailiang Fan,Zhiqian Gao,Yu Gu,Jiabei Wang,Yang Du,Chen Li,Shanshan Wang,Chenjia Zhang,Miaomiao Meng,Duan Wei,Hua Fan. Identification and characteristic analysis of carbonate cap rock: A case study from the Lower-Middle Ordovician Yingshan Formation in Tahe oilfield, Tarim Basin, China. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://cstr.cn/CSTR:11738.14.NCDC.XDA14.PP5772.2024.
Jun Wu,Tailiang Fan,Zhiqian Gao,Yu Gu,Jiabei Wang,Yang Du,Chen Li,Shanshan Wang,Chenjia Zhang,Miaomiao Meng,Duan Wei,Hua Fan. Identification and characteristic analysis of carbonate cap rock: A case study from the Lower-Middle Ordovician Yingshan Formation in Tahe oilfield, Tarim Basin, China. 国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn), 2024. https://www.doi.org/10.1016/j.petrol.2017.12.070.
许可协议
知识共享许可协议   本作品采用 知识共享署名 4.0 国际许可协议进行许可。
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