Study On Niuxintuo Buried Hill Reservoir And Its Hydrocarbon Accumulation Conditions In Liaohe Dpression

Niuxintuo hill of Liaohe Depression exploration earlier, but time-bound, there is nobreakthrough since the reserves reported in recent years. To buried hill reservoir theory, it isnecessary to analyse the Niuxintuo hill reservoir and its accumulation conditions in-depth.In this paper, a new seismic data acquisition, fine structural interpretation,implementation of the structural features Niuxintuo Archaean of; and utilization of logging,logging, coring drilling and laboratory analysis and other information on the hill lithologyfine identification Archaean lithologies are mainly mixed granite, granite (K-feldspar)gneiss, biotite-plagioclase gneiss, hybrid gneiss, mixing rock, broken rock,(plagioclase)amphibolite, diabase, effective reservoirs are the disintegration of mixed granite and somegranitic gneiss. the reservoirs are vertically laminar and laterally zonalburied. the hillreservoir space development showed great heterogeneity because of the infection of theancient topography, structure, and weathering; based on core observation description, cast,mercury, slice rocks, regular physical analysis data indicate that the metamorphic mountainhill reservoir spaces are the cracks and the expansion solution pores and dissolve seam on thebasis of fissures. Hill reservoir spaces is divided into weathering leaching holes of faultfracture zone,tectonic fissures (joints),dissolved holes, Tectonic fractures areprimarily,different fracture development in different lithologies, strong heterogeneity, withzonation. Tectonics, rock types and minerals on the hill bedrock fractured reservoirs play adecisive role. Quality reservoir hill near the structure with broken or fractured fault zone,withmultiple fractures and associated magmatic veins interspersed. Fragmentation of mixedgranite and granitic gneiss, as part of the power quality reservoir rocks, biotite gneisscontaining less than15%as the optimum reservoir.On the hill hydrocarbon accumulationconditions of the analysis showed that the the Archaean buried hill have multi-stage anddiversitied tectonic activity inside, diversity and differences of the lithology forming adistribution of storage or compartment interaction，this are the key formation of the buried hillreservoir.Source rocks of Es4in Niuxintuo sag contacts with the hill sideways, the oil and gasget across the section and the unconformity traps into the hill formed buried hill reservoirs.