Petroleum exploration history and understandings in Santanghu Basin
The oil and gas exploration in the Santanghu Basin began in the 1950s,and from 1950s to 1980s,it mainly focused on surface geological surveys and local exploration.Large-scale oil and gas ex-ploration began in 1990s and achieved good results.Looking back on 60 years of oil and gas exploration practice,the theory of petroleum geology,exploration fields and exploration achievements in Santanghu Ba-sin are reviewed.Based on the analysis of drilling,seismic,reserves,and production data,the exploration process is divided into four stages:geological survey,sandstone reservoir exploration,volcanic reservoir ex-ploration,and tight oil exploration.Taking exploration ideas,scientific and technological innovation,explo-ration technology and major exploration achievements in each stage as the main line,the exploration enlight-enment as well as the achievements and understandings that have big influence on exploration are summa-rized.And then the geological theory and exploration and development technology of Jurassic low permeability and low pressure sandstone reservoir,volcanic rock reservoir and tuff tight reservoir were formed,which pro-moted the continuous breakthrough of exploration in Santanghu Basin,and provided guidance in the next step.