| 基于岩性相单元和孔隙结构的低孔低渗储层有效性测井识别方法:以西湖凹陷NB1构造为例 |
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| 引用本文： | 崔维平,杨玉卿,刘建新.基于岩性相单元和孔隙结构的低孔低渗储层有效性测井识别方法:以西湖凹陷NB1构造为例[J].现代地质,2022,36(1):140-148. |
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| 作者姓名： | 崔维平 杨玉卿 刘建新 |
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| 作者单位： | 1. 中海油田服务股份有限公司, 北京 1011492. 中海石油(中国) 有限公司上海分公司,上海 200335 |
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| 基金项目： | 国家科技重大专项子课题“中深层储层测井新技术资料处理与解释”(CCL2017SHPSOO6EXP)； |
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| 摘 要： | 东海西湖凹陷是近海最大的盆地之一,近些年在中深层花港组储层中获得重大发现.然而,由于储层具有厚度大、非均质性强、低孔低渗、孔隙结构复杂等特征,给精细评价和甜点储层的预测带来极大困难.利用高分辨率电成像资料,在岩性和层理构造识别的基础上,将研究区储层划分成槽状交错层理细中砂岩、板状交错层理细中砂岩、槽状交错层理细砂岩、板...
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| 关 键 词： | 西湖凹陷 中深层储层 电成像 岩性相 孔隙结构 甜点储层 |
| 收稿时间： | 2021-06-28 |
| 修稿时间： | 2021-11-10 |
Logging Identification Method of Low Porosity and Low Permeability Reservoir Effectiveness Based on Lithofacies Units and Pore Structures: An Example from NB1 Structure in Xihu Depression |
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| CUI Weiping,YANG Yuqing,LIU Jianxin.Logging Identification Method of Low Porosity and Low Permeability Reservoir Effectiveness Based on Lithofacies Units and Pore Structures: An Example from NB1 Structure in Xihu Depression[J].Geoscience——Journal of Graduate School,China University of Geosciences,2022,36(1):140-148. |
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| Authors: | CUI Weiping YANG Yuqing LIU Jianxin |
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| Institution: | 1. China Oilfield Services Limited,Beijing 101149,China2. Shanghai Branch of CNOOC Ltd,Shanghai 200335, China |
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| Abstract: | The Xihu Sag in the East China Sea is one of the largest offshore basins. In recent years, major oil and gas discoveries have been made in the reservoirs of the mid-deep Huagang Formation. However, due to the large thickness, strong heterogeneity, low porosity and low permeability, and complex pore structure of the reservoir, it brings great difficulties to fine evaluation and prediction of sweet spots. This paper classified 6 types of micro-scale lithofacies units for the reservoirs in the study area based on the identification of lithology and bedding structure by using high-resolution electrical imaging data, namely trough cross bedding fine-medium sandstone, plate cross bedding fine-medium sandstone, trough cross bedding fine sandstone, plate cross bedding fine sandstone, massive bedding sandstone and calcareous cemented sandstone. And furthermore, NMR logging data was used to finely characterize the pore structure of different lithofacies units. The results show that the three lithofacies of trough cross bedding fine-medium sandstone, plate cross bedding fine-medium sandstone, and trough cross bedding fine sandstone have a drainage pressure less than 0.5 MPa and an average pore throat radius greater than 0.5 μm. The lithofacies of plate cross bedding fine sandstone has a displacement pressure between 0.5 MPa and 1.0 MPa, and an average pore throat radius between 0.25 μm and 0.5 μm. The above four types of lithofacies have coarser lithology, more developed cross bedding, lower displacement pressure, and larger average pore throat radius, which are favorable sweet spots in the study area. Based on the above studies, a classification scheme suitable for fine reservoir evaluation and sweet spots identification in the study area has been established, which provides a reliable basis for further exploration and development in the study area. |
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| Keywords: | Xihu Sag mid-deep formation electrical imaging lithofacies pore structure sweet spot |
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