新疆北部石炭系火山岩地层油气藏特征及其主控因素

Reservoir characteristics and main controlling factors of the Carboniferous volcanics in north Xinjiang

对新疆北部石炭系火山岩地层型油气藏的精细解剖,找出了油气藏形成的主控因素。新疆北部石炭系火山岩风化壳地层型油气藏,按油气藏形态可分为层状、块状及梳状3种油气藏;按油气来源可分为自生自储和新生古储2类。已发现的7个石炭系典型风化壳地层油气藏可归为4种类型:自生自储火山岩风化壳地层层状油气藏、自生自储火山岩风化壳地层块状油气藏、新生古储火山岩风化壳地层梳状油气藏和新生古储火山岩风化壳地层块状油气藏。通过对不同类型地层油气藏的分析发现,其油气来源、主控因素、流体性质等差别较大,但总体而言,控制火山岩风化壳地层型油气成藏的主要因素有4个方面,即风化淋滤作用、后期成岩作用、良好的遮挡条件和构造控制作用。

The stratigraphic reservoirs in the Carboniferous volcanics of north Xinjiang are scrutinized and the main controlling factors of hydrocarbon accumulation are defined.These reservoirs in the Carboniferous volcanic weathering crust can be classified into 3 types by morphology,which are layered,massive and comb reservoirs,and 2 types by oil source,which are ' self-contained source-reservoir' and ' late-source for early-reservoir'.The 7 typical stratigraphic reservoirs already discovered in Carboniferous volcanic weathering crust can be classified into four types,which are layered reservoir of self-contained source-reservoir,massive reservoir of self-contained source-reservoir,comb reservoir of late-source for early-reservoir,and massive reservoir of late source for early-reservoir.Analysis shows that these stratigraphic reservoirs are quite different in oil and gas sources,controlling factors and fluid properties;generally,there are 4 main controlling factors on the stratigraphic reservoirs in volcanic weathering crust,including weathering and leaching,late diagenesis,good barrier condition,and tectonic control.