摘要
利用常规测井资料获取泥岩厚度、含砂率、孔隙度、渗透率、突破压力等,建立了基于试油资料和物性参数的泥质岩盖层有效性评价图版,开展盖层有效性评价方法研究.在单井评价的基础上,利用突破压力和泥岩百分比交会分析,明确了盖层平面展布特征.研究认为,Doseo盆地下白垩统有良好油气显示,但试油失利的主要原因为盖层失效.研究结果显示,研究区盖层的有效孔隙度上限为8%,渗透率上限为10×10^(-3)μm^(2),盖层性质综合判断符合率为87.5%;单井上,K_(1)m_(1)段盖层等级为优-好,K_(1)m_(2)段为好,K_(1)m_(1)段盖层封闭能力强于K_(1)m_(2)段;平面上,北部陡坡带与洼槽带盖层封闭性最好,等级为Ⅰ-Ⅱ类,中部低隆带与南部缓坡带盖层等级为Ⅱ-Ⅲ类,转换带盖层品质最差,等级为Ⅳ类.研究结果指导了盆地残余油测井解释,有望对后续勘探提供技术支持.
The thickness,sand content,porosity,permeability and breakthrough pressure of mudstone are obtained by conventional logging data.The effectiveness evaluation chart of shale caprock based on oil test data and physical parameters is established,and the effectiveness evaluation method is studied.On the basis of single well evaluation,using breakthrough pressure and shale percentage intersection analysis,the plane distribution characteristics of caprock are defined.The main reason for the failure of oil and gas reservoirs in the Lower Cretaceous which has good hydrocarbon display is caprock failure.The results show that the upper limit of effective porosity is 8%and the upper limit of permeability is 10×10^(-3)μm^(2),and the coincidence rate of comprehensive judgment of caprock properties is 87.5%;on a single well,the caprock grade of K_(1)m_(1)is excellent-good,and that of K_(1)m_(2)is good.The sealing capacity of K_(1)m_(1)is better than that of K_(1)m_(2).On the plane,the caprock sealing ability of steep slope zone and trough zone in the north is the best,with the grade of class I-II,The caprock grade of the middle low uplift zone and the southern gentle slope zone is class II-III,and that of the transition zone is the worst,which is class IV.The research results guide the logging interpretation of residual oil in the basin,which is expected to provide technical support for subsequent exploration.
作者
石梦阳
王兵
魏涛
马楠
广怡初
徐炜
任盼亮
吴伟
SHI MengYang;WANG Bing;WEI Tao;MA Nan;GUANG YiChu;XU Wei;REN PanLiang;WU Wei(Research Institute of Exploration and Development,PetroChina Yumen Oilfield Company,Jiuquan 735000,China;Laojunmiao Oil Production Plant,PetroChina Yumen Oilfield Company,Jiuquan 735000,China;Yaerxia Oil Production Plant,PetroChina Yumen Oilfield Company,Jiuquan 735000,China;Research Institute of Logging Application of CNPC Logging Co.,Ltd.,Xi'an 710000,China)
出处
《地球物理学进展》
CSCD
北大核心
2022年第6期2439-2448,共10页
Progress in Geophysics
基金
国家自然科学基金项目(41372103)
中国石油天然气股份有限公司重大专项(2018D-0704)联合资助。