关键词: 深盆气藏, 勘探方法, 综合研究, 压力封存箱, 压力转换带, 异常高压区

Abstract: Deep basin gas trap is considered as the prospective target of gas exploration and research in recent decades.The exploration methods for deep basin gas trap are based on integrative study of geological theory,exploration strategy and engineering techniques.In detail,the integrative study consists of the following three indispensable aspects:① Emphasis on study and application of geological theory for deep basin gas trap during the exploration process;② Multi-subject integrative study on the exploration method based on the specific geological features of deep basin gas trap;③ Improvement of drilling and production techniques.The application of the integrative exploration method for deep basin gas trap in Tongnanba Structural Belt of Sichuan Basin proved the feasibility of this method for identifying the deep basin gas trap.The geological and seismic data indicated that Chixi Syncline has formed "pressure compartment" with favorable source-reservoir-cap rock assemblage and become the prospective area for exploration of deep basin gas trap.The systematic factors/elements of deep basin gas trap were analyzed,and a geological model suitable for deep basin gas traps of Tongnanba Structural Belt was proposed.It is suggested that under the condition of regional geo-pressure transforming zone in the syncline of the structure,and the terrestrial formation from the bottom of Upper Shaximiao Formation to the top of Lower Shaximiao Formation,the local overpressure areas are the important spots for exploration of deep basin gas traps.It is recommended to make further study and to design a wildcat well in this area.

Key words: deep basin gas trap, exploration method, integrative study, pressure compartments, regional geo-pressure transforming zone, overpressure area