| Author's Name: LIU Zhifeng1,2, LI Linzhi1,2, LI Feng1,2, LIAO Jihua1,2, QI Peng1,2 |
| Institution: 1. Research Center of China National Offshore Oil Corp.;
2. China National Engineering Research Center for Offshore Oil and Gas Exploration |
| Abstract: |
| The western slope zone of Xihu Sag is characterized by "small, faulted, poor and scattered". A comprehensive
utilization of various data such as geological logging, well logging, seismic and production has been conducted to
summarize the distribution patterns of oil and gas discovered in the western slope zone. It is believed that the western
slope zone has the characteristics of oil and gas distribution of "north-south zoning, upper-lower stratification, near
source enrichment". By dissecting typical oil and gas reservoirs and analyzing the geological reasons of the failed wells in
the western slope zone, it is believed that traps and migration are the main controlling factors for oil and gas accumulation.
Structural styles determine the type and effectiveness of the trap, and control the types of oil-gas reservoir and differential
enrichment in different zones. The different migration of oil and gas, as well as the two-stage filling and evaporation
fractionation, control the characteristics of near source accumulation and upper oil and lower gas in the study area.By
analysis of reservoir forming condition, it is pointed out that buried hill of Pinghu slope, north section of Tiantai slope and
Yingcuixuan fault belt of Hangzhou slope have better trap and migration conditions, which are new exploration directions
of the western slope zone in Xihu Sag. |
| Keywords: hydrocarbon accumulation; trap type; main controlling factors; exploration field; western slope zone; Xihu
Sag |
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投稿时间：
2025-03-06 |
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