Journal of Petroleum & Environmental Biotechnology

Sweet spots characterization in tight gas- A case study of Sulige gas field, China

2^nd International Conference and Expo on Oil and Gas

October 27-28, 2016 Rome, Italy

Jia Ailin

China National Petroleum Corporation, China

Posters & Accepted Abstracts: J Pet Environ Biotechnol

Abstract:

The gas bearing area of Sulige gas field exceeds 40000 square kilometers in Ordos basin, the 1st and 2nd members of the Permian Shaanxi Formation and the 8th member of the Permian Shihezi Formation, are the major gas pay zones. Due to its low abundance and strong heterogeneity, it is challenging for large scale commercial development of this field. Therefore, looking for sweet spots is currently the priority. Comprehensive geological study confirmed that the reservoirs with coarse grain, high content of quartz are more easily lead to dissolution which is the most constructive diagenesis in Sulige gas field, and the dissolved pores are almost the basis of high quality reservoirs. So the sweet spots are located in the coarse grained sand-bodies with high content quartz, and these sand-bodies are mainly distributed in the lower part of the channel deposits and channel bar deposits. Now the answer is obvious, predicting channels especially the main river channels distribution is the key to search for sweet spots. Through seismic and geological study, first set up the typical log and seismic response characteristics of different types of sands, then carry out sedimentary facies, diagenesis, reservoir evaluation study and so on, finally simulate the channel development. On the base of the geological models, we can predict the sweet spots distribution. This technology has been applied in many blocks of Sulige gas field, the proportion of higher effective wells drilled in the past 5 years increased by a big margin.

Biography :

Email: jal@petrochina.com.cn