No.2East Of Dongying Formation Reservoir In Nanpu Sag Controlling Factors Of Hydrocarbon Accumulation And Mode

The No.2east construction of Nanpu Sag and Nanpu Sag has been found a large numberof similar oil and gas construction, also in the high position of the structure around thehydrocarbon source rock. But now the regional exploration achievement is not ideal. In orderto explore favorable distribution zones and traps in the study area for the discovery of the oiland gas in Dongying group, we collect a large amount of geological data. From the study areafor basic reservoir forming conditions, we analyze the main factors controlling reservoir intothe study area, and the target of trap evaluation.Using3D seismic data and the results of previous studies are divided into6sets offault systems.We combine the third sand section with the first sand section-the east thirdsection, so that, the source faults can be divided into the communication between the Es3and the Es1-Ed3source rock and the only communication Es1-Ed3source rocks.Comprehensive analysis of3-D seismic, drilling and logging data and former research results,the research of sedimentary facies is delta plain, braided river delta, turbidite and deep lakefacies, sand ratio is larger, the basic distribution in20-60%. The stud area of Dongying groupof the cover is mainly the three volcano rock layer and the two east section of upper mudstonecaprock.The part of three section volvano rock layer is development and thinner. Easttwo upper mudstone caprock is region distribution and large thickness. Study offracture profile with the dense band characteristics, can be divided into back type fault step, tothe type of fault zones and back type of fault zones3types. Trap types in the studiedarea is faulted anticline traps, lithologic traps and fault block trap, mainly to fault block traps.According to the background and traps structure development, it can be divided into reversefault footwall traps, forward the foorwall fault traps, the traps, to the hanging wall of the faultanticline traps and lithologic traps. Based on the study of tectonic maps, we use the callbackmethod reconstructed the study area main accumulation period of ancient structures. Usingdrilling, logging and testing data of oil reservoir, we know the type of study area reservoir isfault block reservoirs and lithologic reservoir, mainly to fault block reservoirs. The verticaldistribution of oil in the upper two east section of cover layer, the plane is mainlyconcentrated in the slope of the ridge. Using the evaluation method of fault sealing carries outquantitative evaluation to the sealing ability of lateral fault controlled ring.Through the analysis of the formation conditions and distribution of oil and gas sourcefault relation, communication of Es3-Es1type is favorable for oil and gas accumulation. Inherited paleo high position of the structure is favorable for oil and gas accumulation.Sand ratio is greater than35%favorable lateral diversion. When the east two cover layerdisconnection is less than the thickness of30-34m, the distribution of oil and gas in the Easthave two cover layer. Oil and gas traps reverse fault block controlled aggregation conditionsbetter, fault sealing control trap effectiveness.Dense band edge part and dorsal dense band isbeneficial for oil and gas accumulation beneficial for oil and gas accumulation. According tothe main factors controlling reservoir into above oil and gas is established in the area of oiland gas accumulation model.Based on the analysis of the main controlling factors ofhydrocarbon accumulation, in Nanpu No.2structural section delineates favorable3zone,determine the Ed1I, Ed1II, Ed1III and Ed2o4oil group.Design favorable traps is7.