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Geological Controls on Previous HitSeismicNext Hit Signatures of Volcanic Gas Reservoirs: A Case Study Previous HitfromNext Hit the Changling Fault Depression of Songliao Basin, Previous HitChinaNext Hit

Li, Lun *1; Lei, Xinhua 2; Zhang, Xin 2
(1) Earth and Atmospheric Sciences, University of Houston, Houston, TX.
(2) Previous HitChinaNext Hit University of Geosciences,Beijing, Beijing, Previous HitChinaNext Hit.

The Songliao basin in northeastern Previous HitChinaNext Hit is a Mesozoic rift basin characterized by Mesozoic and Cenozoic hydrocarbon systems. The Changling fault depression located at the south of the Songliao Basin, in which volcanic rock reservoirs are extensively distributed in the Yingcheng Formation, has a good exploration prospect for the favorable accumulation conditions of natural gas. Although great success was obtained in this area, we are still facing great challenges for exploration of volcanic gas reservoirs. Volcanic rocks were buried in depth and lack of sufficient outcrops in the surface of the earth. In addition, scare well Previous HitdataNext Hit and low resolution Previous HitseismicNext Hit Previous HitdataNext Hit in deep formations make it difficult to provide information for distribution, period, age, cycle, occurrence, and rock facies of volcanic rock and hence make challenges for identification of gas reservoirs and the thickness of effect reservoirs. These kinds of problems together would greatly affect the exploration of volcanic gas reservoirs.

Previous Hit3-DNext Hit reflection Previous HitseismicNext Hit and well log Previous HitdataNext Hit were gathered to understand Previous HitseismicNext Hit indicators of volcanic gas reservoirs, the geological factors controlling these Previous HitseismicNext Hit indicators, and thereby predict the distribution of volcanic gas reservoirs. In this paper, the volcanic rock facies were described through an analysis of Previous HitseismicNext Hit features in conjunction with well logs and Previous HitseismicNext Hit attributes like instantaneous amplitude, instantaneous frequency, attenuation attribute in vertical and horizon were extracted to recognize volcano craters and gas reservoir. Under the constraints of volcano craters, two types of volcanic reservoirs including crevice eruption and central eruption are indentified corresponding to the distinct Previous HitseismicNext Hit signatures. Additionally, we have Previous HitappliedNext Hit the broadband frequency constrained simulated annealing Previous HitinversionNext Hit with global optimization to implement our observations. The results indicate that the volcanic rock has larger impendence values compared to the clastic rocks while the gas-bearing volcanic rock has lower impendence values compared to volcanic rock. This is consistent with the analysis of rock physics Previous HitfromNext Hit well log. The distinct Previous HitseismicTop signatures of the volcanic gas reservoirs are governed by the different types of eruption patterns and deep-seated faults.


AAPG Search and Discovery Article #90142 © 2012 AAPG Annual Convention and Exhibition, April 22-25, 2012, Long Beach, California