Xushen1 Sub-area Gas Reservoir Character And Economic Evaluation In The Northern Part Of Songliao Basin

This article utilized several theories such as sequence stratigraphy, modern geophysics, sedimentology, tectonics and economic, carried on multi-disciplinary union attack, took north of Songliao Basin Xushen1 sub-area as the research object, embarked from the foundation geology research, aimed fault basin volcanic rock and conglomerate reservoir special geological condition, rested on the new material, again carried on calculation of reserves and economic evaluation to Xushen1 sub-area.Xushen1 sub-area main growed two sets of reservoirs such as Ying1 section volcanic rock and Ying4 section conglomerates. The volcanic lithofacies dealed volcanic rock physical property with close correlation, volcanic rock was advantageous reservoir and gushed out for the eruption upside subfacies. The conglomerate reservoir physical property deposited condition and the later period diagenesis influence, the sedimentary facies had controlled conglomerate reservoir primary intergranular hole growth, the mixed base content less pigtailed shape delta was most advantageous resembling, between broken stone strut reduced matrix compaction degree, enabled the hole to preserve.Ying1 volcanic rock gas pools fluid distributed obvious characteristic with gas top and water bottom. Various wells unificated gas water contact surface, structure high spot air column big, gas&water contact surface high, low spot air column small, gas&water contact surface was also low. Containing gas highly surpassed deformational trap, lothological trap was the main controlling factor of volcanic rock gas pool creating, generally analysis believed, Ying1 volcanic rock gas pool type was structure lothological gas pool.Yingcheng4 section conglomerate pools was located above Ying1 section volcanic rock gas pools, gathered natural gas created advantageous conditions. Reservoirs were big area continually piece, natural gas distribution was controlled by reservoir physical property. From air column altutide and pressure characteristic, Ying4 section conglomerate aerospheres distribution already surpassed the deformational trap scope, had the lothological gas pool characteristic, generalized analysis, Ying4 section conglomerates gas pool was lothological gas pool.The natural gas field reserves technology economic evaluation target is better, the economical recoverable resources are equal to the technical recoverable resources with 206.69×10~8m~3, deducts has picked output 0.6396×10~8m~3, the surplus recoverable resources are 206.05×10~8m~3. Looked from loss&balance analysis and the sensitive analysis, Xushen1 sub-area development anti- risk ability is stronger, has the feasibility.Xujiaweizi depression resource potential is big, this article mentions the economic evaluation method , other reserves economic evaluations have very good model significance, this method appraisal result confidence level is high, instructs the further prospecting work to have the vital significance.