Study On Reservoir Characteristics And Main Control Factors Of Longwangmiao Formation In Moxi-Longnvsi Area

The Longwangmiao Formation of the Cambrian under the Moxi-Longnvsi area has good gas-bearing properties and broad exploration prospects.On the basis of previous studies,through sediment observation,thin section identification,using drilling,logging,seismic,physical properties,geochemistry and other data,its sedimentary facies,reservoir characteristics,diagenesis,reservoir main controlling factors and developmental distribution A systematic study was carried out and the results showed that:The horizontal distribution of the Longwangmiao Formation in the Moxi-Longnvsi area is continuous and stable,with a thickness of 58-110 m.The stratum is generally thick in the southeast and thick in the northwest According to the lithological and electrical combined sedimentary cycles,the Longwangmiao Formation in the study area is divided into In the second stage,the horizontal distribution of each section is continuous and stable,and the whole area can be traced and contrasted;the development of the Longwangmiao Formation is limited to the mesophase of the platform,and the granular beach is a favorable sedimentary microfacies for reservoir development.The reservoir rocks are mainly sandstones,residual sandstones and grain-clouds.The reservoir matrix has low porosity and permeability,and the full-diameter physical properties are better than the matrix physical properties.The reservoir properties of the Long section are slightly better than those of the dragon.In the segment,the reservoir type is mainly pore(hole)type and crack-pore(hole)type;the longitudinal Shanglong section reservoir generally develops 1 to 2 layers,and the single well is 0.2 to 33.1 m thick.The second member of the Long 2 reservoir is generally developed.1 to 3 layers,the thickness of a single well is between 1.3 and 42.1 m;the reservoir of the upper section of the plane is mainly developed in the transition zone of Moxi and Moxi?Longnvsi,and the reservoir of the second section of the Long is in Gaoshi Ladder?Moxi? The Longnvsi area is developed in a large area;the karst reservoir in the Moxi 9 well area is mainly developed in the Long section,and the Moxi 8 well area develops a set of cave-shaped reservoirs in the Longyi and Long-2 sections,and the Longnvsi area develops.The intercrystalline pore reservoir is the main reservoir,and the cavern type reservoir is locally developed.The formation and distribution of the Longwangmiao Formation reservoir are generally controlled by sedimentary facies,early burial dissolution,epigenetic karstification and hydrocarbon charging;the genesis of the high-quality reservoirs of the Longwangmiao Formation in the Longnvsi area may also be related to the fault system.closely related.The energy storage coefficient(H×?)of the Longwangmiao Formation is well correlated with the thickness of the cavernous reservoir and the amplitude energy of the internal bright spot.Using the variation trend of the energy storage coefficient,the development degree of the cavernous reservoir of the Longwangmiao Formation can be predicted.The distribution of favorable reservoirs;the comprehensive research results have optimized three exploration favorable areas,which provide support and basis for exploration and development.