The Research Of Natural Gas Accumulation In Yingcheng Formation Of Yingtai Fault Depression

Yingtai fault depression is the Jilin area since the Changling fault depression volcanorock gas reservoirs found second with100billion cubic reserves gas-bearing rift. At the sametime, volcano rock gas reservoir is an important domain in recent years for the rift deepexploration, including camp a volcano rock gas reservoir and camp two volcano clasticreservoir. As there are many wells in different area, different objective layer on volcano rockreservoir gas testing get industrial gas flow or high flow, reveals the Yingtai fault depressionvolcano rock gas reservoir exploration prospect.Yingtai fault depression volcano rock gas reservoirs from the discovery and explorationsince the period of nearly6years of time, revealing a total of2sets of hydrocarbon sourcerocks and3sets of gas layers. The hydrocarbon source rocks in Shahe formation andYingcheng Formation two lacustrine mudstone; reservoir of Yingcheng Formation of avolcano rock, camp two heavy volcano clastic rocks and Quantou-Denglouku clastic rock.This topic mainly aims at the camp and camp two gas reservoir are discussed, including campa volcano rocks dominated by lava, overall present drilling revealed in acid, acid and basicvolcano rock, lithology is mainly includes three kinds of rhyolite, dacite, basalt, rhyolite, tufflava rhyolitic breccia facies, mainly effusive facies, eruption. Camp two volcano clastic rocksare mainly tuff, tuffite, Shen tuff breccia, is a volcano sedimentary facies, different is, Yingtaifault depression camp two strata are mainly volcano clastic rock and lacustrine mudstone,therefore both normal sedimentary clastic material and volcano clastic material,(heavy) formulti-source hybrid mode of deposition.This paper focuses on the contents of camp a volcano rock gas reservoir and camp twoheavy volcano clastic gas reservoir, two of them belong to the rift period of YingchengFormation, vertical on the contact relation, but in the mode of deposition, diagenesis,reservoir characteristics are different, so the natural gas enrichment rules are not the same. Inview of geological conditions of the study area is complicated, this topic in Yingtai faultdepression of North and south two blocks, namely LS1and Ls2blocks were analyzed, in thecourse of the study, collected a large number of geological, seismic, logging data, wesummarize that camp, a fire in Yamakawa Kehide are mainly structural gas reservoirs, intoreservoir model under the source and upper reservoir and lateral side storage two; camp twovolcano clastic rock gas reservoirs are mainly lithologic gas reservoir, accumulation models of authigenic reservoir type.