The Research of Reservoir Earthquake Prediction Based on the Design of Horizontal Well of Thin Carbonate Reservoir of J2 Gas Reservoir in Lingyinsi Structure

Compared to clastic rocks, the exploration and development of thin carbonate reservoir are 1more complex. Especially, the thin reservoir demands high resolution of seismic data. So the conventional methods are difficult to good exploration at the present time. According to the complexity of thin carbonate reservoir, we comprehensively analyze reservoir geology, logging and seismic response, combine natural gamma inversion, velocity inversion with porosity inversion for prediction of reservoir and obtain precise quantitative earthquake prediction. The analysis demonstrates the reliability of seismic reservoir prediction applied to design for horizontal well. On the basis of understanding the basic geological characteristics of the reservoir, this thesis takes the design for horizontal well of J21 for example, completes two sets of designs for horizontal wells group by combining prediction technology for reservoir seismic with geologic steering technique and greatly improve the drilling rate for thin reservoir.

Modeling focal parameters for the magnitude 5.3 earthquake of the Xinfengjiang Reservoir area, People's Republic of China

abstract In this paper, the “random test-motion adjustment” method was used for the adjustment of the triangulation net of the Xinfengjiang Reservoir earthquake area, China, and for the inversion of the focal parameters of the earthquake of magnitude 5.3. Retriangulation and leveling data of the earthquake area were thus processed. The estimated focal parameters of the earthquake are: strike, NE 62°; dip, SE at 59°; length of the fault, 4.7 km; depth of the upper boundary, 0.45 km; depth of the lower boundary, 4.5 km; dip-slip dislocation, 73.4 mm; strike-slip dislocation, 25.5 mm; seismic moment, Mo, 2.2 × 1024 dyne-cm; stress drop (Δσ), 12 bars; and the lower limit of the strain energy released (E) 1.2 × 1019 ergs. It was predominantly a normal fault. This paper concludes that the regional stress field provided the main force of the shock, whereas the stress field due to hydraulic pressure contributed the inducing force.