石油地质与工程2025，Vol.39Issue(4)：9-17,9.
曹妃甸A构造沙二段和沙三段储层物性差异特征
Differential characteristics of reservoir physical properties between the second and third members of the Shahejie Formation in Structure A of Caofeidian
贺银军 1宋修章 1蔡涛 1周富春 1郑薇 1卢博文1
作者信息
- 1. 中海油能源发展股份有限公司工程技术分公司中海油实验中心,天津 300452
- 折叠
摘要
Abstract
Although oil and gas have been identified in the Shahejie Formation reservoirs of Structure A in the Caofeidian area of the Bohai Sea,big differences in physical properties and unclear genesis of high-quality reservoirs have severely restricted exploration and evaluation in this area.Using comprehensive petrophysical analyses including cast thin-section microscopy,scanning electron microscopy(SEM),X-ray diffraction(XRD),and carbon-oxygen isotope analysis,this study investigates the reservoir character-istics and property discrepancy mechanisms between the 2nd and 3 rd members of the Shahejie Formation.Key findings reveal that reservoir lithologies are dominated by lithic arkose and arkosic litharenite.The 2nd mem-ber exhibits an average porosity of 11.8％and permeability of 6.57 × 10-3μm2,classifying it as low-po-rosity ultra-low-permeability reservoirs.In contrast,the 3rd member displays mean porosity of 13.8％and permeability of 43.55 × 10-3 μm2,generally categorized as low-porosity low-permeability reservoirs with localized intervals of medium-porosity medium-permeability characteristics.Sedimentologically,the depositional environment is defined as a closed brackish-saline lacustrine system under intense evaporative conditions with prolonged water residence.Reservoir quality is co-controlled by sedimentary and diagenetic processes,where lithological composition emerges as the primary factor governing regional property varia-tions.Significantly,grain size exerts a pronounced influence on pore development,with the 3rd member fea-turing coarser grains than the 2nd member.Early-formed carbonate cements preserved primary pores,pro-viding a substrate for subsequent dissolution.Late-stage dissolution of carbonates,along with feldspar and lithic fragment leaching in the 3rd member,created effective reservoir spaces through secondary porosity de-velopment.关键词
渤海海域/曹妃甸A构造/沙河街组/储层物性差异特征Key words
Bohai Sea/Caofeidian A structure/Shahejie Formation/differential characteristics of reservoir physical properties分类
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贺银军,宋修章,蔡涛,周富春,郑薇,卢博文..曹妃甸A构造沙二段和沙三段储层物性差异特征[J].石油地质与工程,2025,39(4):9-17,9.
