摘要
川中充西地区多口钻井在雷三2亚段泥灰岩储层中油气显示好,测井解释储层发育,展示了良好的勘探潜力。为准确预测雷三2亚段泥灰岩储层纵横向分布,为下一步勘探部署提供指导,首先利用储层合成记录标定明确储层地球物理响应特征;接着围绕岩性和储层分别开展岩石物理分析,优选盐岩和泥灰岩储层的敏感参数,利用地震波形指示模拟预测盐岩的分布;最后利用波形指示反演预测泥灰岩储层的分布。结果表明:雷三2亚段顶部盐岩对应强波峰反射,储层底界对应弱波峰反射,储层与盐岩存在明显的波阻抗重叠,而盐岩与其他岩性在密度上存在明显差异,当去除盐岩的影响后,利用波阻抗可以较好地区分储层和非储层。因此,在利用波形指示模拟识别盐岩分布后,地震波形指示反演可有效识别储层。充西三维区储层大面积发育,厚30~60 m,发育岩性圈闭16个,总面积124 km 2,是下一步富有机质泥灰岩储层的现实勘探方向。
Multiple drillings in the Chongxi area of the central Sichuan Basin have revealed good oil and gas indications in the marlstone reservoir of the Lei32 sub-member.There are widely developed layers of salt rocks on top of the marlstone in the Lei32 sub-member,and the impedance of the salt rock and marlstone reservoirs are similar.Indeed,reservoir predictions are difficult to make using conventional methods due to the strong wave peak shielding effect of the salt rock.To predict the lateral and vertical distribution of the marlstone reservoir accurately,we first used synthetic logging data to calibrate and clarify the geophysical response characteristics of the marlstone reservoir.Then,we conducted a physical analysis of the rock’s lithology and the reservoir,selected sensitive parameters that can identify the salt rock and marlstone reservoir,used a seismic waveform indication simulation to predict the distribution of the salt rock,and finally used waveform inversion to predict the distribution of the marlstone reservoir.The results showed that the salt layer at the top of the Lei32 sub-member corresponded to strong peak reflection,and the bottom boundary of the reservoir corresponded to weak peak reflection.There was a significant overlap of impedances between the reservoir and the salt layer,however,the density of the salt layer differed significantly from that of other lithologies.After removing the influence of the salt layer,the impedances could be used to distinguish between reservoirs and non-reservoirs.Therefore,after using the waveform indication simulation to identify the salt layer,the seismic waveform indication inversion could effectively identify reservoirs.The reservoir in the Chongxi area is extensively developed,with a thickness of 30~60 m,containing 16 developed lithological traps,and covers a total area of 124 km 2,which is a realistic area for searching for new limestone reservoirs.
作者
张豪
辛勇光
马华灵
孙豪飞
朱心健
谢忱
朱可丹
谷明峰
ZHANG Hao;XIN Yongguang;MA Hualing;SUN Haofei;ZHU Xinjian;XIE Chen;ZHU Kedan;GU Mingfeng(PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;Research Institute of Sichuan Basin,PetroChina Research Institute of Petroleum Exploration&Development,Chengdu 610041,China;PetroChina Southwest Oil&Gasfield Company,Chengdu 610041,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第2期247-257,共11页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
中国石油天然气集团有限公司上游领域基础性前瞻性项目(2021DJ0503)。
关键词
川中地区
雷三2亚段
盐岩
泥灰岩储层
波形指示反演
波形指示模拟
central Sichuan Basin
Lei32 sub-member
salt rock
marlstone reservoir
waveform indication inversion
waveform indication modeling
