Numerical Simulation Of Seismic Response Characteristics Of Marine Facies Carbonate Reservoir

Carbonate rocks are widespread in China, Now Tarim basin, Sichuan basin and Pearl River Mouth basin are becoming important regions for carbonate exploration. With development of technology, reservoir exploration has made great discoveries and outbreak at areas of Lungu, Tazhong, Jingbian, Luojiazhai and Qianmiqiao. There are still full of difficulties in the course of exploration because carbonate reservoir are unconventional, irregular, multi-scale space distribution and restrictions of limited spatial resolution. For the complication of the problem, it is hard to make the precise results using the ordinary reservoir identification and prediction technique. The paper has researched the character of seismic response by numerical simulation. The result is valuable for reservoir exploration. The achievements and recognitions are as follows:1. The paper has proposed high accuracy simulating methods for complex geologic model. Firstly methods based on one-way wave equation are discussed such as Fourier finite-difference, methods in the domain of frequency-space, phase shift plus interpolation and general screen propogators, and then propose adaptive interpolation method and point out the potential development of Fourier finite-difference. Accuracy numerical results on the standard data are achieved by these methods while exist discrepancy respectively, finally analyse the accuracy and efficiency quantificationally, it can be used for application as a reference.2. The paper deals with seismic simulating record. Firstly summarize the character ofseismic response of ideal model on fracture and reef by high-precision simulating method, and prove farther the availability for simulating making use of field seismic data processing, it is in favor of identification fracture.3. Seismic response of 3D dimension ring reef model is simulated. Currently carbonate reservoir and attribute parameter are studied almost in 2D while genuine geologic body is 3D. Now reef model is created by integrative structural modeling, and research the character of seismic response by imaging method which is steady for variational reference slowness, Software is programmed and implemented in personal computer and can be used widely in reality.4. Simulating wave propagation in the stratum filling with saturated liquid is studied. Reservoir can be forecasted using the character of high frequency absorption and attenuation. The effectiveness of compensation for high frequency in f-x domain is proved, and the applying situation of the seismic and geology in surface has been given which attenuation of high frequency of seismic wave ban be compensated by numerical simulations. The frequency band of post stack seismic data processed is widened properly and the temporal resolution is increased efficiently without decreasing the S-N ratio in Tazhong area of Tarim basin.