| In Songliao basin,the dominant reservoir of the lower Cretaceous,Yingcheng Formationis volcanic rock. Volcanic activity and hot fluids'pattern in deep are up tocomposition,structure,and regional tectonic stress field of mantle and crust.All the above thatdetermined the distribution of inorganic gas reservoir. Coupling the crusst-mantle structureand foundation faults could be a passage for inorganic gas upflow and then accumulated. Sothe study of Basin deep structure to search for deep natural gas reservoir has importantsignificance.Study of Xujiaweizi fault depression in general development special crust-mantle structure, namelythe low velocity-high conductive layers, thermal mantle diapir and magma chamber, its nature anddistribution of magmatic activity and abiogenic gas closely related. Abyssal crustal and mantle reactedeach other, also closed related each other, caused intricate constrain to abiogenetic gas and incrustal and mantle scale a generation, migration, accumulation delicate match geologicalspace formatted in Xujia Weizi area, Songliao Basin.The mantle plume activity induced by mantleuplift, Moho buried shallow, rising plumes formed hot diapir. The existence of a large number of possiblein deep formation of abiogenic gas substances, is the material basis for the formation of inorganic geneticgas. Volcano rocks in Mesozoic basin research shows, forming process, has a large influx of lithosphericmantle. Through the asthenospheric material rising mantle convection, the overlying lithosphere lithosphereuplift due to heating, and the partial melting of the crust mantle boundary, or in the lithosphere mantlemagma eruption formation, formation of volcano rock, become the important source of inorganic gas, andheat anomaly. At the same time, deep fracture is inorganic gas migration channel, magma intrusion anderuption is also to deep faults for the channel, therefore the abiogenic gas and the deep fracture, is avolcano rocks and thermal anomalies associated output. |
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