According to the fundamental principles of high resolution sequence stratigraphy, this paper focused on the application of high resolution sequence stratigraphy to Silurian strata in Tazhong area. Based on the comprehensive study of logging, drilling and seismic information, the high resolution sequence boundaries of Silurian strata and two scales of datum level cycles (long-term and intermediate-term) can be recognized in Tazhong area. Seven chronstratigraphic boundaries can be recognized in Silurian strata, including four sequence boundaries, which were the transformation from datum level falling to datum level rising, and three flooding surfaces, which the transformation from datum level rising to datum level falling. The Silurian strata in Tazhong area can be divided into three third-order sequences which correspond to three long-term datum level cycles, and 11 fourth-order sequences (parasequence sets) relating to 11 intermediate-term datum level cycles. The classification aforementioned can much better solved the corresponding problem between the six lithological sections of Silurian strata and sequence formations, finally establishes the high resolution sequence stratigraphic framework of Silurian strata in Tazhong area.
On the basis of Cliftons, hydraulic fracturing is established under the condition of cylindrical specimen fracture toughness expression. Using a self-built laboratory equipment, drilling core specimen for the fracture toughness test and obtain the relevant data. Based on the rock parameters inversion theory to construct the formation rock fracture toughness inversion objective function and optimization function. according to the drilling core material fracture toughness test data and the application of Matlab programming presented the formation rock fracture toughness.
Based on the biomarks parameters, we contrast and analyze the relationship between the crude oil of Fuyu and Yangdachengzi oil beds in Chaoyanggou oilfield and the mudstone source rocks of the 1st Member of Qingshangkou formation in Sanzhao depression. There are two source rocks of crude oil in Fuyu oil bed of Chaoyanggou oilfield. They are the mudstone source rocks of the 1st Member of Qingshangkou formation in Sanzhao depression and in Chaoyanggou oilfield, and the contribution of the two source rocks to Fuyu oil bed are nearly the same. The crude oil of Yangdachengzi oil bed in Chaoyanggou oilfield has close relationship to the mudstone source rocks of the 1st Member of Qingshangkou formation in Sanzhao depression, but the relationship with the mudstone source rocks of the 1st Member of Qingshangkou formation in Chaoyanggou oilfield is not obvious. It conforms to the facts that the lower overpressure of mudstone source rocks in Chaoyanggou oilfield makes the thickness of the oil and gas downward shallowed and the quantity of oil into Yangdachengzi oil bed decreased.
The extended finite element is known as the most promising numerical simulation method of crack propagation. In this paper Abaqus software is used to simulate the propagation of the Type I crack and verify the reliability of the numerical methods. With five different vertical distribution of pre-crack established, the paper respectively analyzes the vertical position’s influence on total crack extension form, X direction extension form and Y direction expansion form. By calculating the expansion velocity values, X direction expansion velocity values and Y direction expansion velocity values, the paper also analyzes the influence of crack location on each speed.
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