论川东苟家场构造带天然气勘探

川东苟家场构造带石炭系天敢勘探累遭失利。分析钻探及探井测试资料，认为苟家场构造天然气充满程度不同，原因在于；构造两翼倾轴逆断层封闭性差，石炭系及上覆盖层破碎严重南端已缺失石炭系；氢此，认为家场构造的圈各地层－地垒背斜复合圈闭、志留系气源岩生成的天然气只能在狭２长的圈闭范围内由下向上，自北向南端多，聚集，因而控气范围有限，可能只在构造顶部有气。

NATURAL GAS EXPLORATION IN GOUJIACHANG STRUCTURAL BELT, EASTERN SICHUAN

Natural gas exploration in the Carboniferous of the Goujiachang structural belt in eastern Sichuan has unfortunately not been successful. Based on the analyses of drilling and well testing data for exploratory wells, it is considered that the reasons causing a low gas filling-up to the Goujiachang structure are the poor sea1ing of axial reverse faults at both nanks of the structure, serious break of the Carboniferous and the overlying cover and the absence of the Carboniferous at the southern end of the structure' Therefore, it is concluded that the Goujiachang structure is a stratigraphy-horst anticline combination trap' Natural gas generated from the Silurian gas source rock could only migrate from bottom to'top and from south to north and accumulated within the trap, resulting in a limited holding gas area and gas probably being only located at the top of the structure. Gouxi structure is a stratigraphic-faulted nose, combination trap, which is bounded by reverse fault at the east side and by the wide Shenjiachang syncline at the west side, covers a large area and lately outcropped, indicating there existed good preservation conditions and a large gas source area, which made the trap becoming a favourable one for gas exploration. Goudong structure is a trap located in the foot wall of the fault, which has effective fault feeling, late formation outcropping and good accumulation conditions for the Carboniferous and possesses sufficient gas source due to closing the Zhenki wide syncline, indicating it is a good potential trap for gas. There is still a potential of discovering high production gas reservoirs in the Carboniferous of the Goujiachang structural belt.