电磁井震约束反演识别川中深层裂谷

四川盆地川中地区GS1井在深层取得重大突破，使该区成为勘探热点。但因地震资料深部反射不清，油气勘探进程受阻，在此地区开展重磁电震联合勘探具有重要意义。本文应用电磁井震约束反演技术，利用该区测井和地震资料建立中浅层模型，进行电磁约束反演深层构造，提高了深层目标的反演精度，首次揭示川中地区深部存在裂谷型断陷盆地。结合前人资料，认为该深层裂谷盆地肩部位及断陷内次级凸起带是下一步勘探的有利目标区。

Deep rift identification with MT inversion constrained by shallow logging and seismic data

The Central Sichuan Basin has become a hot spot for oil and gas exploration since a great deep discovery in Well GS1 area.However oil and gas exploration rhythm in this area slows down later due to unclear deep seismic reflection.So gravity,magnetic,electromagnetic and seismic joint exploration may provide great help.We put forward in this paper an idea of magnetotelluric (MT) inversion constrained by shallow logging and seismic data for deep rift identification.We first build a shallow layer model based on logging and seismic data,and then carry out MT inversion constrained by the model to improve deep target imaging.Our research reveals a deep rift-type faulted basin in the Central Sichuan Basin.Combined with previous data,we consider that the shoulder part of the deep basin and the secondary uplift in fault depressions are favorable targets for the future exploration.