The Prediction And Explanation Of Changxing Reef Reservoir In LM Area Of East Sichuan

Reef reservoir with the advantages of large reserves high yield and good porosity has great research value in marine carbonate rocks. Marine natural gas reserves in Sic huan basin have been become the largest proved basin in the Marine natural gas res erves in China. With the deepening of exploration of Marine natural gas in the east Sichuan basin, ChangXing reef reservoirs which are the main reservoirs become the emphasis for research in recent years.Longmen region is located in the eastern part of sichuan basin. There are reef-bank gas reservoirs such as Puguang?Huanglongchang and Gaofengchang which developed in the eastern trough of Kaijiang-Liangping, and some reef-bank gas reservoirs such as Yuanba ? Longgang and so on were found in the west there. Reef reservoirs that belong to trapping gas reservoirs of carbonate rocks have high porosity and permeability, but the reservoirs have strong heterogeneity, big differences in vertical and horizontal force and deep buried depth.From the perspectives of geophysics,the corresponding seismic event is messy and discontinuous.Meanwhile the seismic data has low resolution and its internal structure is messy as well the positive solutions are multiple, thus bringing many difficulties to the exploration and development work.So this article is based on the multi-disciplinary theories which include drilling data, logging data,and seismic data, meanwhile through full understanding of regional geological background,four facies belt zones that include trough?terrace?platform margin and foreslope were divided in the study area, as well as the reef-bank reservoir range of profitability which was analyzed and described by the combination of seismic attributes and seismic facies.By logging data and seismic data,the geophysical response characteristics of reservoirs were analyzed and the seismic attributes were extracted. Meanwhile combining with seismic inversion, the reservoirs prediction was carried out and and distribution map of ChangXing reservoirs was painted. Eventually objective layer was comprehensively evaluated and the favorable exploration area was confirmed.