玛湖凹陷及其周缘石炭—二叠系油气勘探前景  

Petroleum Exploration Prospects of Carboniferous-Permian in Peripheral Mahu Sag,Junggar Basin

作　　者：陈刚强[1] 安志渊[1] 阿布力米提[1] 李啸[1] 许秋来 张鸾沣 

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]南京大学地球科学与工程学院,南京210023

出　　处：《新疆石油地质》2014年第3期259-263,共5页Xinjiang Petroleum Geology

基　　金：中石油科技重大专项(2012E-34-01)

摘　　要：准噶尔盆地玛湖凹陷及其周缘石炭—二叠系因埋藏深、勘探程度低,对其成藏条件和勘探潜力均认识不清。分析了研究区油气基本成藏条件后指出,玛湖凹陷石炭—二叠系发育3套优质烃源岩(石炭系、下二叠统佳木河组和风城组),它们均处于高成熟演化阶段,以形成高熟油气为主,油气源充足;研究区发育着继承性前隆背斜、掩伏带背斜和断块圈闭,以及地层、断层-地层圈闭等非构造圈闭;在玛湖凹陷深层还发育特殊类型储集层,包括石炭系佳木河组火山岩与风城组白云质岩,由于断裂、裂缝和风化壳发育,其储集层物性得到改善。研究认为,玛湖凹陷石炭—二叠系具备形成高产油气藏的基本地质条件,可作为盆地勘探的新领域。优选了达1井背斜作为近期首选的钻探目标,以期获得突破。The hydrocarbon accumulation conditions and exploration potential of the Carboniferous-Permian in Mahu sag and its periphery in northwestern Junggar basin have received little research attention due to deep burial depth and associated low exploration degree. This paper analyzes the basic hydrocarbon accumulation conditions and indicates there exist three source sequences in this area, including the Carboniferous, the Jiamuhe formation and the Fengcheng formation of the Lower Permian, which are all in highly matured evolution stage, with sufficient oil-gas source, and dominated by highly matured hydrocarbons. In this study area, large structural and stratigraphic traps are developed widely, including inherited foreland uplift anticlines, piedmont anticlines, fault block traps, stratigraphic and fauh-stratigraphic traps. It is found in deep Mahu sag that special types of reservoirs are developed, such as volcanic reservoirs of the Carboniferous and the Jiamuhe formation and the dolomitic reservoir of the Lower Permian Fengcheng formation. In addition, wide development of fault, fracture and weathering crust has resulted in improvement of the reservoirs quality. It is suggested that the deep-buried lower hydrocarbon accumulation assemblage has the basic geological conditions for forming oil and gas pools with relatively large scale and high production, and could be as a new domain for petroleum exploration in Junggar basin. Also, the anticline surrounding Well DA-1 has been selected as preferred exploration target to look forward to get breakthrough.

关 键 词：准噶尔盆地 玛湖凹陷 石炭系 二叠系 油气成藏 勘探前景 

分 类 号：TE112.1[石油与天然气工程—油气勘探]