Study On The Fluid Dynamics And Accumulation Characteristics In Kelasu Area, Kuqa Depression

Kuqa depression is located in the northern of Tarim basin, in the west of China is one of the key area of oil and gas exploration, Kelasu structural belt of Crassus-Yiqikelike Kelasu-is in the western part of the structural belt, in recent years have discovered Dabei, Carat and other large gas field. Cenozoic Himalayan movement in the action such as strong, make the fluid dynamic structure, distribution and hydrocarbon accumulation rule complicated. This article through to the Kelasu structural belt accumulation of power, especially the accumulation of the critical period fluid power distribution, evolution characteristics are analyzed, combined with the birth, storage, cover reservoiring constraint conditions, so as to further strengthen the oil and gas migration, Kelasu area of knowledge accumulation.For the research, through collecting the regional information and the previous research, and on the basis of using the corresponding research method and technology of regional power and the fluid accumulation characteristics are analyzed. In particular, the use of basic logging data test data analysis in the study area now formation pressure, combined with the structural evolution, burial history analysis to determine the critical period of the critical period accumulation and restore fluid power, analyzes on the influence of the natural gas together; Then in combination with regional source rocks, reservoir combination, such as petroleum fracture cover accumulation conditions, the comprehensive control factor analysis of natural gas accumulation characteristics, accumulation rule. The main know has obtained are:(1)Kelasu regions layer extensively develop abnormal pressure, regional abnormal pressure evolution through three stages:one is the Suweiyi group at the sedimentary end of abnormal pressure before basic not development, and the second is Jidike deposition to end the deposition of the causes for abnormal pressure increasing and in Kuqa sedimentary end group (accumulation key period) peak period, three is eroding since the end of Kuqa, abnormal pressure for the rise and fall of coexist period, the overall trend expression for the weakening of pressure.(2)Analysis layer each depositional period of the momentum of the distribution, found that the evolutionary stages momentum distribution basic similar, high value area is located in the area south of the partial Baicheng sag, the momentum of the evolution also has a certain stage, analyzed that Kapushaliang group within the natural gas has from the southern city of partial worship in west high potential area in the north and northeast large areas of the long distance migration carat may.(3)Kelasu area hydrocarbon source rocks condition is superior, anointed mudstone caprocks large thickness closed, and a strong ability sandstone reservoir property good, moreover abnormal pressure for hydrocarbon source layer hydrocarbon-expulsion migration provides good dynamic conditions, linking the upper and lower strata of fracture fluid migration to provide a good channel, in these advantages under the common function of Kelasu in the development that many large and medium-sized reservoirs, become the key area of exploration and development.