关键词: 川东北地区, 黄龙场气田, 飞仙关组, 碳酸盐岩, 储层预测, 地震属性, 鲕粒滩体

Abstract:

The characteristics of deposition in the carbonate reservoirs of Feixianguan Formation in the Lower Triassic of Huanglongchang Gas Field in the northeastern Sichuan Basin were studied by the use of geologic-seismic integrated method. The seismic profile was flattened to the base of Member 4 in Feixianguan Formation to restore the depositional paleogeomorphology during the Feixianguan period. The result indicated that the eastern area was higher than the western area in the depositional paleogeomorphology, and the platform-edge, slope and continental shelf were developed from east to west. According to the seismic response characteristics, four types of seismic facies were recognized. The distribution of seismic facies was divided using the neural network waveform clustering technique. The research of seismic attribute shows that the oolitic bank reservoir in Feixiangan Formation has the characteristics of high amplitude, high frequency attenuation and abnormal phases, and the oolitic bank reservoirs mainly distributed in the eastern area of D4-h16-h19 wells. The application of the constrained sparse spike inversion method found that the oolitic bank reservoirs of Feixianguan Formation had apparently abnormal low P-wave impedance and were developed in the range of 0~60 ms above the base of Member 4 of Feixianguan Formation. The 3-D space distribution of oolitic bank in Feixianguan formation was described by using the 3-D seismic data. The field application of the reservoir seismic prediction system has achieved good effects in the prediction of the oolitic bank reservoirs in the northeastern Sichuan Basin.

Key words: northeastern Sichuan Basin, Huanglongchang Gas Field, Feixianguan Formation, carbonate rock, reservoir prediction, seismic attributes, oolitic bank reservoirs