四川盆地西南部上二叠统玄武岩含气性研究

GASBEARING STUDY OF P_2 BASALT IN THE SOUTHWEST PART OF SICHUAN BASIN

１９９２年底，在四川盆地西南部周公山构造所钻的周１井首次在上二叠统玄武岩中获得阮阻流量５０万ｍ＾３／ｄ的工业气流，引起了各界关注，并开始对玄武岩的含气性进行研究。研究认为：玄武岩是四川盆地一个新的具有广阔前景的含气领域，可供勘探面积约１．９万ｋｍ＾２，可供钻探构造达４０个，储层属孔洞－裂缝型，局部有裂缝－孔洞型，气源充足，天然气主要来自玄武岩侧向的上二叠统煤系，也有来自下伏阳新统的混源气。

It is verified that the basalt in Sichuan Basin is a new gas-bearing domain being of wide exploration potential by Zhou-1 well of which open flow capacity is 50×10￣4 m￣3/d, drilled in P_2 basalt of Zhougongshan structure in southwest part of the basin. The domain has 1.9×10￣4 km￣2 explorative area and 40 structures being able to drill. The reservoir belongs to vug-fissure type, some area is fissure-vug type. Gas source is sufficient. The gas is mainly from P_2 coal measure on the basalt side or is the mixing source gas from bower Yangxin Series. In the light of reservoir changes, oil-gas mothballing conditions and differential accumulation principle, the structural zones being nearer gas souce and higher elevation such as Zhongongshan, Zhanmaoshan, Hanwangchang, Sanshuchang, Shoubaochang,Laolongba, Tiangongtang etc are considered having the best gas-bearing conditions and should be firstly explored.