Enrichment Characteristics Of Oil And Gas Of The Maxi Area In The Raoyang Depression

Maxi area is located in the northeast of Raoyang depression, which strikes northeast,including Maxi sag, Nanmazhuang buried hill tectonic belt, Balizhuang buried hill tectonic belt and Renqiu buried hill tectonic belt.This area mainly develops lower part of Es1 and Es3 two sets of hydracarbon source rock with multiple sets of reservoirs and cap rocks assemblages Ng formation, Ed1, Ed2, Ed3, Es1,Es2,Es3 and buried hill. 3D seismic acquisition, processing and interpretation of hydrocarbon-rich sag, the whole sag or the main part of the sag has been basically completed.Since the discovery of Renqiu ancient buried hill reservoir in 1975, through scale exploration of buried hill and Tertiary structural reservoir, exploration difficulties in Maxi sag are added year by year and discoveries are less than before.There are still some problems such as reservoir development of the sag, good oil source condition, favorable preservation of capping layers and good hydrocarbon accumulation condition. In recent years exploration in Es2 has taken efect, but it is still unclear about the sandbody distribution in the deep Es3 and the above Dongying and Es1 section and the hydrocarbon accumulation regularity, which restrict the exploration steps in Maxi area. The overall research thought of this paper is based on the petroleum resource, identify the current exploration situation, and make clear the potential of the field. Researches on hydrocarbon accumulation conditions and models are conducted in different fields to identify the key geological factors restricting hydrocarbon formation and accumulation.Through research, it is concluded as follows: First, sedimentary research shows that it is mainly braided river(fan) delta deposition at Maxi region during Es2 and Es3,and develops the accordingly sand body type which has better reservoir physical properties.Second, through the study of the known reservoir, hydrocarbon migration channels are made clear. They are unconformity of the buried hill zones, nose-shaped uplift of the slope zones and fault zones connected oil source in shallow structures.Third,to build antithetic fault block accumulation model of in-source pattern in the subsag belt, stratigraphic-lithologic accumulation model of in-source pattern in Rendong slope belt, and Stratigraphic-lithologic accumulation model of out-source pattern in Nanmazhuang slope belt.Research knowledge is applied to the exploration practice, hydrocarbon is successively discovered in the main subsag belt in Maxi region, Nanmazhuang slope belt and Rendong slope belt. 24 wells are deployed for drilling in all, 15 of which obtain industrial oil flow, initially forming a five thousand- ton reserves replacement area.