成都理工大学学报（自然科学版）2016，Vol.43Issue(2)：153-162,10.DOI:10.3969/j.issn.1671-9727.2016.02.02
蓬莱9-1构造花岗岩古潜山大型油气田的成藏过程
Hydrocarbon accumulation process of large scale oil and gas field of granite buried hill in Penglai 9-1 structure,Bohai,China
摘要
Abstract
The granite buried hill weathering crust reservoir of Penglai 9-1 on the bulge of Miaoxibei in Bohai is a large scale oil and gas field firstly discovered in offshore China.However,the mechanism of hydrocarbon accumulation in granite buried hill in such a large-scale oilfield during the Yanshan movement is rarely studied. Therefore, different methods of core observation, thin section identification,fingerprint fossil comparison and hydrocarbon basin simulation are used to analyze the reservoir characteristics of granite buried hill,oil and source rock correlation and conditions of hydrocarbon accumulation,so as to restore the hydrocarbon accumulation process and construct the accumulation mode of Penglai 9-1 structure. According to the extent of weathering, granite weathering crust is divided from top to bottom into three parts:sand-gravel weathered zone,fracture zone and the bedrock zone respectively.The thickness of weathering crust varies from several tens of meters to even more than two hundred meters.It shows that the main reservoir space of oil and gas is dissolution pores and micro-cracks in the rocks and the oil source of buried hill comes from the first and third Groups of Shahejie Formation and Dongying Formation in the southern depression of east Bohai area.Favorable reservoirs are covered by seal rock of Guantao Formation of Neogene and mainly distributed in the high part of the weathering crust.The buried hill oilfield is characteristic of 3 layers structure with source rocks at the bottom,reservoir in the middle and cap rocks on the top,a combination of young source rocks in old reservoirs.The study proposes that high pressure drives hydrocarbon to migrate through fault-related unconformity and result in warehouse accumulation.关键词
蓬莱 9-1 构造/燕山运动期/花岗岩古潜山/成藏过程/成藏模式Key words
Penglai 9-1 structure/Yanshan movement stage/granite buried hill/hydrocarbon accumulation process/hydrocarbon accumulation mode分类
能源科技引用本文复制引用
徐国盛,陈飞,周兴怀,王昕,李建平,王国芝,王霄,范蕾..蓬莱9-1构造花岗岩古潜山大型油气田的成藏过程[J].成都理工大学学报（自然科学版）,2016,43(2):153-162,10.基金项目
国家科技重大专项（2011ZX05023-001-014）。 （）
