NATURAL GAS EXPLORATION POTENTIAL OF SINIAN IN THE MIDDLE OF SICHUAN BASIN

Characteristics of natural gas and reservoir bitumen in the area of Anpingdian-Gaoshiti have been studied by means of gas reservoir,and it is concluded that,source of oil and gas is mudstone in the Qiongzhusi group of Cambrian.Combined with history of regional structure and thin-section analysis,it is suggested that,there are 4 periods of oil and gas accumulation.It is also pointed out that,exploration potential of natural gas in the 4th section of Dengying group of Sinian in the Anpingdian-Gaoshiti area is good,and the key of drilling is to find good reservoir and to avoid drilling on the belt of bitumen seal.