Characteristics And Description Of Crack In Xiagou Group Cretaceous In Qingxi Area

Qingxi sag is located in the western part of Jiuquan basin, the sag is the main hydrocarbon source rocks in west depression,which have found within the west oil fields and duck son gorge oilfield.Yumen Oilfield is a development of more than 70 years old fields, which have more than 60% of the production tasks are concentrated in the old, the use of the low degree of reserves is basic buried deep and geological characteristics is complex. Enrichment regularity understanding unclear oil and gas blocks can production and the production. Low key in producing reserves and potential blocks can be effective development. Qingxi area using the reserves is generally complicated low permeability lithologic reservoir, which depends on the energy development and the lack of displacement. Normally in recent years the development of the reservoir through the advanced water injection and fracturing acidification in our country improve injection-production well number which adjust the pattern, injection-production ratio, changes in reservoir control of the bottom hole flowing pressure. Such as adjusting the speed of oil reservoir and displacement of the dynamic changes in reservoir which increase recovery factor of low permeability reservoir and achieved a certain economic benefits.Closely with concave production practice of exploration and development is in accordance with the research content of the project and based on the whole sag in the implementation of the value goal and block built region. The optimization of exploration and development are carried out accordingly in the deployment, goals, structure, sedimentary, reservoir, reservoir evaluation and the location of work, for the preliminary exploration of oil and gas, and which provides a guarantee to the construction of a productivity of reservoir evaluation.Jiuquan basin in the southwest of Qilian mountain is before Qingxi oilfield. Qingxi oilfield is east from fault to southern raised from 509 as the boundary and north from up Qingcaowan-Qingbei 2 well-Hongliuxia north of a line to the north trunk line, south of the southern boundary of Jiuquan basin boundary now is more than ten thousands meters. Qingxi area is 475 km2, which west sag total resources have 2.98 x 108t accounting for 56% of the Jiuquan basin resources, and accounting for 76% of the wine in the Jiuxi depression total resource, which can be proved to be the oil-rich sag of Jiuquan basin, and proven oil geological reserves is 1.62 x 108 t. Not only for depression far Laojunmiao, Yaerxia, Shiyougou fields provides plenty of oil source, and within the sag in the lower cretaceous. Qingxi oilfield cretaceous reservoirs have been found.Crack is a kind of widely distributed in different lithology and subjected to different as if tectonic deformation discontinuity and gradually formed. Because of the complexity of the reservoir fracture, crack size of the uncertainty, variability of crack depth, crack precipitate of multiple classes and comprehensive landscape changes. The traditional research thinking to forecast the crack, but is almost impossible. Even if the fracture reservoirs have great exploration potential, but because of crack distribution characteristics of the research is not accurate. And make exploration failure damage is also huge.