中国石油大学学报（自然科学版）2017，Vol.41Issue(1)：42-50,9.DOI:10.3969/j.issn.1673-5005.2017.01.005
渤海湾盆地渤中凹陷深埋古潜山天然气成藏主控因素探讨
Major controls on natural gas accumulations in deep-buried hills in Bozhong Depression, Bohai Bay Basin
摘要
Abstract
Paleozoic commercial gas reservoirs were discovered in deeply buried hills in Bozhong depression by two scientific exploration drilling-wells.The gas production from the A2 well was up to 40.2×104 m3,and the gas reservoirs were currently the deepest buried and have the highest subsurface temperature in the offshore Bohai Bay Basin.Gas accumulations in the buried-hill reservoirs and their controls were studied by systematic interpretations on core data,well-logging data and seismic data in Bohai sea,and the results suggest that there are four major contributors for the gas accumulation in Bozhong 21-22 buried-hill reservoirs:Bozhong 21-22 buried-hill reservoirs were large anticlines with enough trapping areas for the gas;there were good source rocks of members Sha-4 to Dong-3 in the Bozhong Depression with huge thickness,which were in high hydrocarbon potentials and thermal maturity;great reservoir spaces with dissolved caves and fractures were developed in the buried-hills with good petrophysical properties;and the gas were accumulated obviously late and were in good timing among essential elements of petroleum geology,which meant late and continuous gas charging into the buried-hills so significant controlling on hydrocarbon accumulation.The successful discovery of Bozhong 21-22 buried-hill gas reservoir is not only a breakthrough of natural gas exploration for buried-hills in deep part of the depression,but also an achievement of understanding hydrocarbon accumulation in buried-hill reservoirs in the deep part of the depression,which provides a great prospective to oil and gas exploration in buried-hills in similar conditions in Bohai Bay Basin.关键词
渤中凹陷/科学探索井/深埋古潜山/天然气成藏/主控因素Key words
Bozhong Depression/scientific drilling well/deep-buried hill/natural gas accumulation/key control factor分类
能源科技引用本文复制引用
周心怀,张如才,李慧勇,王保全,郭永华..渤海湾盆地渤中凹陷深埋古潜山天然气成藏主控因素探讨[J].中国石油大学学报（自然科学版）,2017,41(1):42-50,9.基金项目
国家科技重大专项(2011ZX05023-006) （2011ZX05023-006）
