Permeability Estimation of Shale Oil Reservoir with Laboratory-derived Data: A Case Study of the Chang 7 Member in Ordos Basin  

岩石物理实验数据驱动的页岩油储层渗透率预测--以鄂尔多斯盆地长7段为例

作　　者：Zhang Lin Gao Li Ba Jing Zhang Meng-Bo José M.Carcione Liu Wei-Hua 张琳;高丽;巴晶;张盟勃;José M.Carcione;刘卫华(河海大学地球科学与工程学院,江苏南京211000;中国石油长庆油田分公司勘探开发研究院,陕西西安7100182;National Institute of Oceanography and Applied Geophysics(OGS),Sgonico,Trieste 34010;中石化石油物探技术研究院有限公司,江苏南京211103)

机构地区：[1]School of Earth Sciences and Engineering,Hohai University,Nanjing,Jiangsu,211000 [2]Exploration and Development Research Institute of PetroChina,Changqing Oilfield Company,Xi'an Shanxi,710018 [3]National Institute of Oceanography and Applied Geophysics(OGS),Sgonico,Trieste 34010 [4]Sinopec Geophysical Research Institute,Nanjing,Jiangsu,211103

出　　处：《Applied Geophysics》2024年第3期440-455,616,共17页应用地球物理（英文版）

基　　金：supports from the National Natural Science Foundation of China(42104110,41974123,42174161,and 12334019);the Natural Science Foundation of Jiangsu Province(BK20210379,BK20200021);the Postdoctoral Science Foundation of China(2022M720989);the Fundamental Research Funds for the Central Universities(B210201032).

摘　　要：The shale oil reservoir within the Yanchang Formations of Ordos Basin harbors substantial oil and gas resources and has recently emerged as the primary focus of unconventional oil and gas exploration and development.Due to its complex pore and throat structure,pronounced heterogeneity,and tight reservoir characteristics,the techniques for conventional oil and gas exploration and production face challenges in comprehensive implementation,also indicating that as a vital parameter for evaluating the physical properties of a reservoir,permeability cannot be effectively estimated.This study selects 21 tight sandstone samples from the Q area within the shale oil formations of Ordos Basin.We systematically conduct the experiments to measure porosity,permeability,ultrasonic wave velocities,and resistivity at varying confining pressures.Results reveal that these measurements exhibit nonlinear changes in response to effective pressure.By using these experimental data and effective medium model,empirical relationships between P-and S-wave velocities,permeability and resistivity and effective pressure are established at logging and seismic scales.Furthermore,relationships between P-wave impedance and permeability,and resistivity and permeability are determined.A comparison between the predicted permeability and logging data demonstrates that the impedance–permeability relationship yields better results in contrast to those of resistivity–permeability relationship.These relationships are further applied to the seismic interpretation of shale oil reservoir in the target layer,enabling the permeability profile predictions based on inverse P-wave impedance.The predicted results are evaluated with actual production data,revealing a better agreement between predicted results and logging data and productivity.鄂尔多斯盆地延长组页岩油储层油气资源储量丰富,近年来一直是该探区非常规油气勘探开发的重点目标,但其具有孔喉结构复杂、非均质性强、储层致密等特点,现有的油气勘探开发技术难以完全适用,并且作为评价储层物性的重要参数渗透率很难有效预测。本研究以鄂尔多斯盆地Q区页岩油层系的21块致密砂岩样本为研究对象,系统地开展不同围压下的孔渗联测、超声波以及电阻率实验,结果显示实测的孔隙度、渗透率、超声波速度以及电阻率均随有效压力非线性变化,进而基于实验数据和等效介质理论模型构建适用于测井与地震尺度的纵横波速度、渗透率以及电阻率与有效压力之间的经验关系式,得到纵波阻抗-渗透率与电阻率-渗透率的经验关系式。预测结果与测井曲线渗透率的对比显示,所构建阻抗-渗透率关系式的预测结果要优于电阻率-渗透率关系式的预测结果。同时将关系式应用于目的层页岩油储层地震解释,利用反演的纵波阻抗预测了渗透率剖面,结合实际生产资料对结果进行了评价,对比显示预测结果与测井资料、产能情况基本符合。

关 键 词：shale oil reservoir P-wave impedance RESISTIVITY PERMEABILITY rock physics experiment 

分 类 号：TE311[石油与天然气工程—油气田开发工程]