A TECTONIC OUTLOOK OF MOBILISM ON BASIN STUDY

A short review of history on the oil and gas-bearing basin study reveals the development to experience a zigzag path of structural-sedimentory-tectonic researches.The recent contributions of petroleum geology should be attributed to the plate tectonics.To face a grim situation of oil and gas exploration,we should develop and perfect the tectonic outlook of mobilism,which is a guiding ideology and theoretical instruction on basin study.In the process of basin occurring and sediments depositing,the following changes can be observed in a basin:(1) the basin geometry and framework,(2) the inner textures,(3) the growth structures,(4) the tectonic setting and provenance,(5) the basin type and its formation,and (6) the geothermal pattern.Spatially,the basin analysis of mobilism is expressed by the following relationships:(1) the part and the whole of a basin,(2) a single basin and the basin group,(3) the regional and the local stress fields,and (4) the tectonic styles in the shallow and the deep.In addition,the complexities of continental margins and geothermal fields should be emphasized.A unitedly kinematic process and dynamic mechanics between orogenics and basin evolution can be explored from the viewpoints of (1) compression and tension being interdependent,(2) transformation by strike-slip faults,and (3) deep-seated courses.To comprehend the basin occurring,sedimentation and thermal action,the three efforts should be ma ken greatly:(1) to sum up the features of basin evolution related to the global tectonic cycles,(2) to take tectonics as a key link and to synthesize the knowledges of structural geology,sequence stratigraphy,sedimentology,geochemistry,geothermology,groundwater dynamics and oil-gas accumulation dynamics,and (3) to understand the reformation or influence of the youngest tectono-thermal event.