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Marine Origin Petroleum Geology >

2025 , Vol. 30 >Issue 1: 71 - 81

DOI: https://doi.org/10.3969/j.issn.1672-9854.2025.01.006

Main controlling factors of oil and gas accumulation and new exploration fields in the western slope zone of Xihu Sag, East China Sea Basin

  • LIU Zhifeng , 1, 2 ,
  • LI Linzhi 1, 2 ,
  • LI Feng 1, 2 ,
  • LIAO Jihua 1, 2 ,
  • QI Peng 1, 2
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  • 1. Research Center of China National Offshore Oil Corp.
  • 2. China National Engineering Research Center for Offshore Oil and Gas Exploration

LIU Zhifeng, MSc, a young technical expert and senior engineer at CNOOC Research Institute Co., Ltd, mainly engaged in research on oil and gas exploration in Chinese offshore new fields. Add: China National Offshore Oil Corporation Building, No. 6 Taiyanggong South Street, Chaoyang District, Beijing 100028, China. E-mail:

Received date: 2024-05-06

  Revised date: 2024-10-12

  Online published: 2025-05-13

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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.

Key words： hydrocarbon accumulation; trap type; main controlling factors; exploration field; western slope zone; Xihu Sag

Cite this article

LIU Zhifeng , LI Linzhi , LI Feng , LIAO Jihua , QI Peng . Main controlling factors of oil and gas accumulation and new exploration fields in the western slope zone of Xihu Sag, East China Sea Basin[J]. Marine Origin Petroleum Geology, 2025 , 30(1) : 71 -81 . DOI: 10.3969/j.issn.1672-9854.2025.01.006

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