收稿日期: 2015-05-05
修回日期: 2015-07-12
网络出版日期: 2015-11-20
基金资助
国家科技重大专项(编号:2011ZX0500800340;2011ZX0500800252);甘肃省重点实验室专项(编号:1309RTSA041)联合资助.
The Controlling Factors of Hydrocarbon Accumulation of Carboniferous Volcanic Rock in the Dixi Region,Junggar Basin
Received date: 2015-05-05
Revised date: 2015-07-12
Online published: 2015-11-20
基于钻井资料、地震资料,野外露头剖面和地球化学资料的分析,对准噶尔盆地滴西地区石炭系火山岩气藏进行研究,认为其油气藏类型属于自生自储型火山岩油气藏,天然气主要来自石炭系巴塔玛依内山组与滴水泉组生烃供给,烃源岩有机质类型主要为Ⅱ2—Ⅲ型,表现出典型的高—过成熟特性。烃源岩和火山岩储层直接接触或靠断裂沟通,具有近源成藏特征。火山岩风化体对储层物性具有明显控制用,风化壳厚度在200~300m之间时,火山岩储层物性最好。在火山喷发期间或喷发后期,构造作用使脆性火山岩发生破裂,形成大量的裂缝和微裂隙,增加了火山岩储层内部的渗流能力,且火山岩成岩晚期的风化淋滤作用形成了大量的次生溶蚀孔隙,使储层的物性条件大大改善.同时,上覆的二叠系梧桐沟组泥岩,为油气成藏提供了必要的优质封盖。
史基安,郭晖,吴剑锋,姚爱国,邹妞妞,吴志雄 . 准噶尔盆地滴西地区石炭系火山岩油气成藏主控因素[J]. 天然气地球科学, 2015 , 26(S2) : 1 -11 . DOI: 10.11764/j.issn.16721926.2015.S2.0001
Based on geochemical,drilling,field profile and seismic data,it can be found that the gas of volcanic rock of Carboniferous in the Dixi area was mainly derived from the source rocks of Carboniferous Bashan group and Dixiquan Group,of which the type of organic matter were type Ⅱ2-Ⅲ,and the maturity is high-over mature.This type of reservoir formed from short distance migration of oil and gas,and the source rock and volcanic rock reservoir contacted directly or connected by crack,so it is concluded that the study area has the characteristics of near source reservoir formation.The weathering crust of volcanic rock has obvious reservoir-controlling function.Among them,the properties of volcanic rock were the best when the thickness of the weathering crust was at 200-300m,which may be related to weathering and leaching at this depth.In the period of volcanic eruption or later,structure stress caused the brittle volcanic rock to be fractured,and cracks and micro-cracks form fluid drainage system within the reservoir,which increased the seepage ability of volcanic rock reservoir.The shale of Permian Wutonggou Formation in Dixi area provided the necessary overlying strata for the oil and gas accumulation.
Key words: Junggar Basin; Carboniferous; Volcano rock; Oil and gas accumulation
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