西南石油大学学报（自然科学版）2023，Vol.45Issue(6)：57-68,12.DOI:10.11885/j.issn.1674-5086.2022.03.31.04
基于地震数值模拟的溶洞型储层地震特征分析
Seismic Characteristics Analysis of Karst Cavity Reservoirs Based on Seismic Numerical Simulation
郑多明 1汪家洪 2肖又军 1肖文 1高宏亮1
作者信息
- 1. 中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒 841000
- 2. 西南石油大学地球科学与技术学院,四川成都 610500
- 折叠
摘要
Abstract
The"string of beads"response is a common feature on seismic section of carbonate karst reservoir in Tarim Basin.In order to understand the beaded response characteristics of different karst caves,a three dimensional model constituted of car-bonate fracture-cavern bodies and strike-slip faults has been built based on the interpretation from real seismic data.Seven single-factor controlled modes of karst cavity body combinations are imbedded in the model.According to fluid type,cave size,distance to strong reflection interface,vertical resolution distance,lateral resolution distance,filling type and porosity.The numerical seismic simulation is performed over the model and the reverse time migration is done to the simulated data.For the"beads"response characteristics of the seven single-factor controlled modes on the migration section,a detailed com-parison and analysis is made in respect of the relationship between the resolution,amplitude energy and controlling factors.The corresponding changing patterns on seismic section to the variation of controlling factor are concluded,and the following conclusions are obtained.The"beads"response of the different fluid type in karst cave are hardly distinguished on the migrated section.And its influence is mainly reflected in the variation of relative amplitude energy with effective elastic parameters.The energy amplitude of"beads"response has a positive relationship with the cave size.The distance of cave apart from the strong axis will affect the energy amplitude of the response.The vertical distance between caverns does not affect the beading response form of a single caverns,but affects the amplitude energy on the connection part.If the horizontal distance between caverns is too small,the"beads"response of two caverns will merge and form the"beads"illusion of a large cavern.The degree of mud filling and porosity in the cave will affect the amplitude energy of the"beads"response.By summarizing the variation rules of seismic response characteristics under the control modes of different factors and variables,the pattern recognition can provide a reference for effective prediction of fracture-cavity reservoirs.关键词
缝洞型储层/三维数值建模/反射特征/"串珠"响应/逆时偏移Key words
fracture-cavern reservoirs/3D numerical modeling/reflection characteristics/"bead"responses/RTM分类
能源科技引用本文复制引用
郑多明,汪家洪,肖又军,肖文,高宏亮..基于地震数值模拟的溶洞型储层地震特征分析[J].西南石油大学学报（自然科学版）,2023,45(6):57-68,12.
