Characteristics Of Fluid Field And Its Effect On Oil Accumulation In Santanghu Basin

During the past several years exploration in the Santanghu basin , we have got the considerable petroleum geological .But considering its complex geological situation , involving several petroleum exploration fields , several pressure systems coexisting and different types reservoirs producing , furthermore its oil-gas reservoirs often turn out to be unconventional . and its bad heterogeneity reservoir , all of the above has brought great difficulties to the exploration and exploitation . At present , the problem is that using the comprehensive study to find out the expansion feature and controlling factors about the fluid field . Also to find out its reservoir-forming mechanism and distribution pattern . Choose the high output zone for explotation . In ordor to increase the output. So , it is urgent to find out the feature and influencing factors about the fluid field .This paper is mainly about the malang and tiaohu sag in the santanghu basin , so I have to collect the materials about the formation , structure , lithfacies and geochemistry of formation water , using the analyses the history about the fluid in the basin . so as to do the research about the evolution characteristics of the fluid field from ancient to now , and explore the relationship with the oil and gas migration , accumulation and so on . Using the evolution characteristics of the fluid field and the influence on the oil-gas reservoirs as the main research objects , using the computer simulation and different kinds of testing approach , so as to do a overall research about the evolution characteristics of the fluid field .With the new viewpoints of the fluid geology and folw fields , in the systematic thought, based on combining the theory and practice ,the experiment and simulation , so as to characterize the fluid field that controls the oil and gas aggregation and distribution , and do a research on the spatial distribution features , and find out what makes the differences between the fluid fields and its control effects on the hydrocarbon migration and accumulation . Furthermore find out the distribution , differences , controlling factors of the fluid field and the hydrocarbon filling model.Research indicates that , all the pressure systems of the Santanghu basin are in the closed state . However at the egde of the basin the fault may get in touch with the surface water . The fluid field is closed overall , but opens to outside partly . The fluid power system in the jurassic stratum changes from compaction drive to gravity drive , petroleum migration partly depends on the power from the surface water intrusion . In the vertical Santanghu basin can divide into the depression belt in Jurassic stratum and hydrostatic pression belt in the Permian stratum , all the pressure coefficients in the Jurassic stratum below 1.0 , and become bigger from the southwest to the northeast in the basin , the maximum locates in the Niuquanhu structural belt; the pressure coefficients in the Permian stratum change from 0.7 to 1.1 , and become bigger from the northeast to the southwest in the basin , the maximum locates in the Heidun belt.