Geological Model Of Complicated Carbonate Reservoir With Multi-cycle

The core of reservoir research is to find a kind of statistics way accorded with the objectivivity, by which we can find some rule from wild data, and illustrate reseroir's 3D distribution by means of all kinds of math methods. As we all know, the carbonate rock's original nature is far more complicated than clastic rock, and it has obvious heterogeneity for it's very sensible to diagenesis. By now, carbonate reservior's evaluation and prediction still stayed at a half-ration level. So it will has great affection to carbonate reservoir's exploration and exploitation on the base of delicately illustrating the carbonate reservoir's lateral spreading, its ration evaluation, as well as building reservoir's geological model(especially permeability model). In this paper, the author picked up Jia2 gas reservoir of Moxi structure of Middle Sichuan as the research object. On the base of reservoir's mating sample analyses, guided by the theory of high-frequency cycle of shallow-water carbonate, the author has done the following works:firstly, to delicately divide the strata into member; secondly, guided by sedimentology and well logging geology, delicately study the microfacies by analyzing regional depositional backgroud, well logging facies, depositional micro-ghysiognomy, and petrology; thirdly, build up the suitable geology model for well logging interpretation on the base of reservoir's mating analysis and statistics rule's analyses .finally, calculate the industrial lower limit of different type reservoir by means of all kinds of mathematics ways and evaluate the reservoir with main-factor analyses; build up the reservoir's classification standard. The author try to find the key reason of reservoir formation and evolution, as well as the early stage reservoir's distribution rule in space and time by studying on the diagenesis. In the end, the author built up the reservoir's geological model and defined the reservoir's plane distribution by the ways of the leading reservoir's facies-controlling model building and fuzzy mathematics. In this paper, such approaches were presented as micro- physiognomy recovery of depositional stage, multi-factor depositional microfacies analysis, dynamic reservoir origin analysis and well logging interpretation with geological fine bound. It's the first time to bring the ways of well logging interpretation with geological fine bound, main-component analysis and fuzzy mathematics into the reservoir's ration evaluation and model- building of complicated carbonate reservoir with multi-cycle, and form the unique model- building way of complicated carbonate reservoir with multi-cycle at last.