The Simulation Analysis Technology And Application On Rift-basin Subsidence And Compressive Reversal Process

This paper takes the tectonic subsidence history, palaeogeothermal history and hot history as the rationale, having developed a set of basin structure subsidence history analogous system in the CoralDraw12 environment; having consummated the RBTHM analogous system on Visual C++ based on the structure subsidence history and the ancient ground temperature history before, which has launched the organic matter maturity Ro and TTI history simulation of the hot history.Taking the vertical seismic profile's time to deep data as the first-hand information, and using the Gauss -Rodang law, the author carries on deep rod's fitting, transform the time profile to the depth, and to its curve digitization, simultaneously unifies the basin sandy rate, the ancient water depth and the sea level change to carry on the structure evolution section under the CoralDraw12 platform using VBA and at last calculate the basin compression quantity.The stratum depth data which obtains by the CoralDraw12 platform, sandy rate, the ancient water depth, the sea level change, disintegration quantity on each time each spot, the subsidence time as well as the basin the well Ro-H curve is the basic data, the author has launched the simulation of the basin sedimentation rate, the heat flux, the pale-geothermal gradient, the asthenosphere top highly as well as the stretch quantity computation, and have developed the organic matter maturity Ro simulation in the hot history which mainly uses the method of the Ro-T law and the Ro-TTI law.Having applied the basin tectonic subsidence history system and RBTHM in the East China Sea Xihu sag basin and the Gulf of Tonkin basin the analogous system, it concludes that: simulation of the East China Sea Xihu sag basin indicated that the basin subsidence experienced from the crack fast subsidence first to slow later, finally arrived at the evolutionary process which fast sinks; The crack falls to the function having many times; The basin has the intense elongation function; The compression quantity in the center is biggest; The hydrocarbon source rock in Oujiang River group starts oil window in the Pinghu group deposition, the Pinghu group hydrocarbon source rock enters the uncooked oil window in the Oligocene later period, all enters the uncooked oil stage on the Miocene intermediate stage; The Gulf of Tonkin basin Xuwen region to simulate hollowly indicated that on the different structure evolutionary phase the sedimentation rate changes and that controls the sequence growth's action, the sedimentation rate of Liushagang group and Weizhou group in the earlier is high, afterward the sedimentation rate changes to low, which has reflected the characteristic of process; After wind-drift sand port group depositional stage, the basin has buried deeply with the organic matter thermal evolution stage, which was advantageous in the hydrocarbon source rock maturity.