准噶尔盆地东部石炭系海相砂岩气藏特征、潜力与勘探方向  

Characteristics,potential and exploration direction of Carboniferous marine sandstone gas reservoirs in eastern Junggar Basin

作　　者：林潼[1] 杨威[1] 焦立新 马强 杨润泽 龚德瑜 LIN Tong;YANG Wei;JIAO Lixin;MA Qiang;YANG Runze;GONG Deyu(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Research Institute of Exploration and Development,Tuha Oilfield Company,PetroChina,Hami 839009,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油吐哈油田分公司勘探开发研究院,新疆哈密839009

出　　处：《天然气地球科学》2024年第2期245-258,共14页Natural Gas Geoscience

基　　金：国家自然科学基金委企业创新发展联合基金(编号:U22B6002);中国石油“十四五”前瞻性基础性重大科技项目(编号:2021DJ0605,2021DJ0306)联合资助。

摘　　要：准噶尔盆地石炭系已发现的天然气储量几乎全部集中于火山岩储集层中。石钱1井首次在石炭系海相砂岩储层中获得高产工业油气流,开辟了盆地石炭系天然气勘探的新领域。为评价石炭系海相砂岩型天然气藏的潜力和勘探方向,从烃源岩、储集层、天然气类型以及构造与成藏演化过程等方面,对准东地区石钱滩凹陷石炭系石钱滩组气藏开展综合分析。结果显示:①石钱滩组发育上下两段烃源岩层,受海侵和海退影响,两段烃源岩在有机质丰度、厚度以及分布范围等方面具有差异;②海相砂岩储层受压实和胶结作用影响,孔隙空间不发育,主要储集空间为微溶蚀孔和微裂缝,储层物性整体较差;③石钱滩组发育煤型气和油型气2种类型天然气,其中石钱滩凹陷北东方向的高产井为油型气特征,天然气主要来源于下段烃源岩,北西方向的低产井为煤型气特征,天然气更多来源于上段烃源岩;④石钱滩组烃源岩生烃强度大、勘探潜力巨大,下段烃源岩层保存条件好,具备形成自生自储型气藏的有利条件,勘探前景最好。Almost all the natural gas reserves of Carboniferous system have been found in volcanic rocks in Jung⁃gar Basin.Well Shiqian 1 has obtained high production industrial gas flow in carboniferous marine sandstone res⁃ervoir for the first time,which opens up a new field of carboniferous natural gas exploration in the basin.In or⁃der to evaluate the exploration potential of marine sandstone reservoirs,and point out the direction of natural gas exploration,comprehensive analyses for the source rocks,reservoirs,natural gas types,structural evolu⁃tion and accumulation process of Shiqiantan Formation were carried out,and it is concluded that:(1)There are two sets of source rocks in Shiqiantan Formation.Influenced by transgressive and regressive environment,the two sets of source rocks have slight differences in the abundance of organic matter,thickness and distribution of organic matter.(2)Under the influence of compression and cementation,the pore space of marine sandstone reservoir is not developed,and the main reservoir space is micro-corrosion pore and micro-fracture,and the physical property of the reservoir is poor.(3)There are two types of natural gas in Shiqiantan Formation:oiltype gas and coal-type gas.The high-producing wells in the northeast direction of the depression show oil-type gas characteristics,and the natural gas mainly comes from the source rock of the lower member,while the lowproducing wells in the northwest direction show coal-type gas characteristics,and the natural gas mainly comes from the source rock of the upper member.(4)The source rocks of Shiqiantan Formation have high hydrocar⁃bon generation and great exploration potential.The source rocks of the lower section have good preservation conditions and favorable conditions for developing self-generated and self-storage gas reservoirs,and the explo⁃ration prospect is the best.

关 键 词：准噶尔盆地 石钱滩组 海相砂岩储层 油型气 勘探潜力 

分 类 号：TE121.11[石油与天然气工程—油气勘探]