羌塘盆地隆鄂尼地区油砂矿地质特征及成藏模式
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摘要
为研究羌塘盆地隆鄂尼地区油砂矿资源潜力,通过剖面地质调查、岩心描述、薄片鉴定、物性测试和含油率测定等方法,对隆鄂尼地区地表及钻井油砂样品的岩性、物性及含油性特征进行分析,结合油砂露头剖面及钻井连井剖面特征,对研究区油砂矿地质特征及油砂矿成矿模式进行分析研究。结果表明,研究区油砂主要以中—细晶白云岩为主,油砂层总体厚度较大,但储层物性较差,属于低孔低渗储层,而含油率较高,属于"B级"油砂矿。隆鄂尼地区油气主要来自布曲组碳酸盐岩和泥岩,为自生自储型古油藏。综合分析认为,羌塘盆地隆鄂尼地区油砂矿由岩性封闭配合构造抬升共同作用形成。研究结果可为进一步勘探该地区油砂资源提供一定的理论依据。
Geology profile survey,core description,thin-section identification,physical property test and oil content tests were used to study the resource potential of oil sand in the Longeni of Qiangtang Basin. The lithology,physical and oil-bearing properties of surface and drilling oil sand samples were analyzed to investigate the geology and oil sand accumulation patterns through combining with the oil sand outcrop and drilling well-tie profiles. Result indicates that the oil sand in this area with relatively large thickness is mainly composed by medium-fine crystal dolomite. However,the oil sand with relatively poor quality and relatively high oil content is considered as the low-porosity and low-permeability reservoir,which is classified as a"Class-B"oil sand. The hydrocarbon in Longeni mainly migrates from the carbonate rocks and mudstones in the Buqu Formation,which is regarded as a self-generation and self-preservation paleo-reservoir. Comprehensive analysis believes that both the lithology sealing and tectonic uplift lead to the oil sand accumulation in Longeni of Qiangtang Basin. This research could provide certain theoretical reference for the further exploration of oil sand resource in this region.
Geology profile survey,core description,thin-section identification,physical property test and oil content tests were used to study the resource potential of oil sand in the Longeni of Qiangtang Basin. The lithology,physical and oil-bearing properties of surface and drilling oil sand samples were analyzed to investigate the geology and oil sand accumulation patterns through combining with the oil sand outcrop and drilling well-tie profiles. Result indicates that the oil sand in this area with relatively large thickness is mainly composed by medium-fine crystal dolomite. However,the oil sand with relatively poor quality and relatively high oil content is considered as the low-porosity and low-permeability reservoir,which is classified as a"Class-B"oil sand. The hydrocarbon in Longeni mainly migrates from the carbonate rocks and mudstones in the Buqu Formation,which is regarded as a self-generation and self-preservation paleo-reservoir. Comprehensive analysis believes that both the lithology sealing and tectonic uplift lead to the oil sand accumulation in Longeni of Qiangtang Basin. This research could provide certain theoretical reference for the further exploration of oil sand resource in this region.
引文
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[2]李宁熙,黄海平,孙晶晶,等.松辽盆地西部图牧吉油砂地球化学特征[J].石油与天然气地质,2015,36(4):581-586.
[3]法贵方,康永尚,王红岩,等.东委内瑞拉盆地油砂成矿条件和成矿模式研究[J].特种油气藏,2010,17(6):42-45.
[4]万友利,王剑,谭富文,等.羌塘盆地隆鄂尼-昂达尔错地区布曲组白云岩储层成因及孔隙演化特征[J].东北石油大学学报,2017,41(3):21-34.
[5]万友利,王剑,万方,等.羌塘盆地南部古油藏带布曲组碳酸盐岩稀土元素特征及意义[J].石油实验地质,2017,39(5):655-665.
[6]李启来,伊海生,梁定勇,等.羌塘盆地隆鄂尼-昂达尔错地区中侏罗统布曲组碳酸盐岩储层特征研究[J].科学技术与工程,2014,14(31):183-188.
[7]张立强,纪友亮,李永铁,等.羌塘盆地侏罗系白云岩储层特征研究[J].石油实验地质,2001,23(4):384-389.
[8]陈浩,王剑,王羽珂,等.西藏隆鄂尼-昂达尔错地区布曲组白云岩地球化学特征及成因[J].新疆石油地质,2016,37(5):542-547.
[9]周文,邓虎成,尹海生,等.西藏羌塘盆地侏罗系白云岩储层中油砂资源评价[J].矿物岩石,2007,27(4):85-90.
[10]宋红莎,张晓宝,曹占元,等.隆鄂尼地区油砂地质及地球化学特征[J].大庆石油地质与开发,2017,36(1):43-49.
[11]王成善,伊海生,李勇,等.羌塘盆地地质演化与油气远景评价[M].北京:地质出版社,2001:184-215.
[12]陈明,王剑,谭富文,等.藏北北羌塘坳陷中西部地区布曲组碳酸盐岩烃源岩分布特征[J].石油实验地质,2010,32(2):181-185.
[13]秦建中.青藏高原羌塘盆地油气资源潜力分析[J].特种油气藏,2006,28(6):566-573.
[14]胡明毅,龚文平,文志刚,等.羌塘盆地三叠系、侏罗系石油地质特征和含油远景评价[J].石油实验地质,2000,22(3):245-249.
[15]陈浩,陈明,孙伟,等.羌塘盆地隆鄂尼-鄂斯玛古油藏带中侏罗统布曲组岩相古地理研究[J].沉积与特提斯地质,2018,38(2):76-81.
[16]王成善,伊海生,刘池洋,等.西藏羌塘盆地古油藏发现及其意义[J].石油与天然气地质,2004,25(2):139-143.
[17]伍新和,王成善,伊海生,等.西藏羌塘盆地烃源岩古油藏带及其油气勘探远景[J].石油学报,2005,26(1):13-17.
[18]王羽珂,王剑,万友利,等.南羌塘坳陷古油藏带布曲组白云岩储层特征及控制因素分析[J].沉积与特提斯地质,2017,37(1):1-8.
[19]彭智敏,廖忠礼,陈明,等.青藏高原羌塘盆地侏罗系白云岩的特征及其成因[J].沉积与特提斯地质,2008,28(4):1-6.
[20]陈文彬,杨平,张予杰,等.南羌塘盆地扎仁古油藏白云岩储层特征及成因研究[J].沉积与特提斯地质,2006,26(2):42-46.
[21]黄华谷.羌塘盆地双湖地区布曲组含油白云岩发光性研究[D].成都:成都理工大学,2008.
[22]甘贵元,张建英,段国绿,等.青藏地区油砂矿品级划分标准研究[J].青海石油,2013,31(4):18-21.
[23]南征兵,张艳玲,李永铁,等.羌塘盆地油气成藏主控因素分析[J].天然气地球科学,2012,23(3):469-473.
[24]徐建永,武爱俊.页岩气发展现状及勘探前景[J].特种油气藏,2010,17(5):1-6.
[25]彭清华,杜佰伟,谢尚克,等.羌塘盆地昂达尔错地区侏罗系烃源岩生物标志物特征及其指示意义[J].石油实验地质,2017,39(3):370-376.
[26]曹占元,申繁华,龙国徽,等.油砂山地区油砂矿地质特征及成藏模式[J].特种油气藏,2016,16(6):27-30.
[27]崔鑫,李江海,李维波,等.中国东西部油砂矿带成藏对比及勘探启示[J].特种油气藏,2016,23(1):1-5.
[28]赵政璋,李永铁,王岫岩,等.羌塘盆地南部海相侏罗系古油藏例析[J].海相油气地质,2002,7(3):34-36.
[29]吴珍汉,刘志伟,赵珍,等.羌塘盆地隆鄂尼-昂达尔错古油藏逆冲推覆构造隆升[J].地质学报,2016,90(4):615-627.