Abstract
Tectonic fractures are a significant factor for production of the Longmaxi formation in Dingshan area. The analyse of the distribution and development degree of tectonic fractures is the main research method in present-day. Based on the data of field outcrops and borehole core, the new method-binary method is put forward by rock fracture and energy value to decide tectonic fracture development. According to the method the fitting formula is offered between the relation of the value of rock fracture, energy and the fracture density. Compared the fracture density predictive value and the observed value of 15 wells, all wells relative error less than 25%. The prediction results are accurate. According to the fitting formula of fracture development and distribution in the study area are obtained. The results show that the fracture density is high as a whole of the Longmaxi formation in Dingshan area. Whole shows by south east to gradually reduce the trend of the north west. Supported the future of the oil and gas exploration to provide geological basis and guidance in Dingshan area.
Highlights
With a heightened level of global oil and gas exploration, fractured hydrocarbon reservoirs have become an important new field for exploration (He & Wei, 2007; Pu & Qin, 2008) The identification, accurate description, and semi-quantitative-qualitative study of the tectonic fractures in reservoir strata are the keys to their effective development at a later stage (Pu et al, 2008)
This study aims to predict the development and distribution situation of the tectonic fractures in the reservoir strata of the study area and to provide a new geological reference and basis for oil and gas exploration and development in the area
Since 2013, major breakthroughs in oil and gas exploration have been attained in the field of marine shale gas exploration in the Dingshan area, as daily productions of 3. 4×104 m3 and 10. 5×104 m3 in industrial gas flows were obtained at the DY1 and DY2 wells, respectively, reflecting the good exploration prospects for shale gas in this area
Summary
With a heightened level of global oil and gas exploration, fractured hydrocarbon reservoirs have become an important new field for exploration (He & Wei, 2007; Pu & Qin, 2008) The identification, accurate description, and semi-quantitative-qualitative study of the tectonic fractures in reservoir strata are the keys to their effective development at a later stage (Pu et al, 2008). Wang, Dai, Sheng, Qiao & Li (2009) and Wang (2007) applied the fractal dimension method to carry out predictions. These methods have all made major contributions to fracture prediction, but there are still deficiencies in terms of the quantitative prediction of fractures. This study aims to predict the development and distribution situation of the tectonic fractures in the reservoir strata of the study area and to provide a new geological reference and basis for oil and gas exploration and development in the area
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