Main controlling factors and exploration directions for hydrocarbon accumulation in the south-central parts of the central anticlinal belt of West Lake sag
The West Lake sag has great exploration potential for deep—ultra-deep oil and gas resources,with good exploration pros-pects.In order to clarify the main controlling factors of oil and gas accumulation in the south-central parts of the central anticlinal belt of West Lake sag,the tectonic background,sedimentary characteristics,source rock conditions and reservoir properties of the central anti-clinal belt of West Lake sag were analyzed and studied.By analyzing the distribution characteristics of oil and gas in different zones in the south-central parts of the central anticline zone of the West Lake sag,the distribution law of oil and gas enrichment and the main control factors of differential accumulation were summarized,and the accumulation model was established.The results show that the main controlling factors of oil and gas accumulation in the south-central parts of the central anticlinal belt of West Lake sag are the early connect-source fault coupled with sand body and the late preservation conditions.According to the combination of storage caps and oil and gas distribution law,it can be divided into Pinghu Formation,Huagang Formation and Longjing Formation,among which the Hua-gang Formation is the main accumulation layer system,and the Huagang Formation has the sedimentary environment for developing li-thologic bodies and the conditions for forming lithologic and stratigraphic traps.The continuous hydrocarbon generation of source rocks provides sufficient oil and gas sources.The reservoir performance of deep—ultra-deep sandstones is still good,and the low-permeability reservoirs are widely developed in 3 900～3 700 m.Favorable sedimentary facies belts superposition secondary dissolution controls the distribution of high-quality reservoirs,and oil and gas charging has a good relationship with the formation time of traps.The research re-sults have certain guiding significance to the continuous exploration and development of West Lake sag.
oil and gas accumulationmain controlling factoraccumulation modelWest Lake sagcentral anticlinal belt
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