Quantitative discrimination of hydrocarbon micro-seepage pattern
-
摘要: 调研前人关于烃类微渗漏方式的研究成果,发现油气藏形成之后烃类微渗漏方式以微泡方式和水溶方式为主。通过建立等厚地层模型,提出微渗漏方式定量判别系数,基于一般地质规律假定相关参数进行计算,分析认为:(1)烃类微渗漏方式在地层中并不是一成不变的,因地质条件变化可相互转变;(2)烃类微渗漏方式总体以微泡方式为主,随地层变浅水溶方式所占比例逐渐增加,此2种方式是形成地表烃类异常的主要方式,而扩散作用只形成背景场;(3)直接盖层封盖能力、地层物性和垂向可动水含量是影响烃类微渗漏方式的重要因素。烃类微渗漏方式定量判别系数的提出,对烃类垂向微渗漏机制研究从定性走向定量意义重大,为油气化探地球化学场数值模拟、成因解释与评价奠定了基础。Abstract: Studies of hydrocarbon micro-seepage have indicated that,when reservoir has been formed,oil and gas mainly seep as micro-bubble or with water.Based on isopachous stratigraphic model,a quantitative discrimination coefficient of micro-seepage pattern has been proposed and calculated according to general geological theory.It has been concluded that,1) Due to the changes of geological conditions,the micro-seepage pattern of hydrocarbon in strata is also changing;2) Hydrocarbon usually seeps as micro-bubbles and transfers to water-soluble pattern as it comes closer to earth surface.The 2 pa-tterns result in hydrocarbon abnormality on earth surface while diffusion only forms background field;3) Sealing ability of direct seal,stratigraphic physical property and vertical movable water content are the key factors controlling hydrocarbon micro-seepage pattern.Proposal of the discrimination coefficient is significant for micro-seepage mechanism research.It also settled a foundation for numerical simulation,formation interpretation and evaluation of geochemical field in hydrocarbon chemical exploration.
-
[1] 许怀先,陈丽华,万玉金,等.石油地质实验测试技术与应用[M].北京:石油工业出版社,2001. [2] 程同锦,王国建,范明.油气藏烃类垂向微渗漏的实验模拟[J].石油实验地质,2009,31(5):522-527. [3] 黄志龙,高耀斌,郝石生.天然气盖层浓度封闭的定量评价及其应用[J].沉积学报,1996,14(2):89-94. [4] 付广,付晓文,吕延防.盖层对油气聚集的控制作用[J].天然气地球科学,1999,10(5):17-22. [5] Abrams M A.Significance of hydrocarbon seepage relative to petroleum generation and entrapment[J].Marine and Petroleum Geology,2005,22(4):457-477. [6] 汤玉平,宁丽荣,蒋涛,等.积雪油气化探方法试验研究[J].石油实验地质,2009,31(3):287-291. [7] 蒋涛,汤玉平,吴传芝,等.油气藏上方吸附丝指标异常模式及成因分析:以塔里木盆地英南2井侏罗系气藏为例[J].石油实验地质,2009,31(4):403-408. [8] MacElvain R.Mechanics of gaseous ascension through a sedimentary column[C]//Heroy W B.Unconventional methods in exploration for petroleum and natural gas.Dallas:Southern Methodist University Press,1969:15-28. [9] Price L C.A critical overview and proposed working model of surface geochemical exploration[C]//Davidson M J.Unconventional Methods Exploration for Petroleum and Natural Gas Ⅳ. Dallas:Southern Methodist University Press,1986:245-304. [10] Klusman R W,Saeed M A.Comparison of light hydrocarbon microseepage mechanisms[C]//Schumacher D,Abrams M.AAPG Memoir 66:Hydrocarbon migration and its near-surface expression. Tulsa:AAPG,1996:157-168,203-221. [11] Saunders D F,Burson K R,Thompson C K.Model for hydrocarbon microseepage and related near-surface alterations[J].AAPG Bulletin,1999,83:170-185. [12] 汤玉平,王国建,程同锦.烃类垂向微渗漏理论研究现状及发展趋势[J].物探与化探,2008,32(5):465-469. [13] 文百红,林蓓,刘吉敏.油气微渗漏的垂向结构与地面地电化学油气检测[J].石油勘探与开发,1999,26(5):33-35. [14] Wen Baihong,Putikov O F.Gas bubble-facilitated transport of metals in lithosphere[J].Transactions of Nonferrous Metals Society of China,1999,9(1):152-157. [15] 辛忠斌,张交东,丁丽荣,等.油气微运移的烃类相态[J].河南石油,2002,16(4):8-10. [16] 李明诚.石油与天然气运移[M].北京:石油工业出版社,2004. [17] 吕延防,于润涛.盖层微渗漏及其可能性研究[J].天然气工业,2004,24(10):14-16. [18] 夏响华,杨瑞琰,鲍征.烃类组分垂向微运移的模拟研究[J].石油与天然气地质,2003,24(3):260-263. [19] 付广群,陈敏烨.天然气微渗机理研究[J].国外油田工程,2002,18(8):31-33. [20] Leythaeuser D.Role of diffusion in primary migration of hydrocarbon[J].AAPG Bulletin,1981,66(4):408-429. [21] Brown A.Evaluation of possible gas microseepage mechanisms[J].AAPG Bulletin,2000,84(11):1775-1789. [22] 郝石生,张振英.天然气在地层水中的溶解度变化特征及地质意义[J].石油学报,1993,14(2):12-21. [23] 付晓泰,王振平,卢双舫.气体在水中的溶解机理及溶解度方程[J].中国科学(B辑),1996,26(2):124-130. [24] 付晓泰,王振平,卢双舫,等.天然气在盐溶液中的溶解机理及溶解度方程[J].石油学报,2000,21(3):89-94. [25] 张云峰,付广.一种计算气藏中水溶释放气贡献量的方法[J].新疆石油地质,2002,23(1):46-48. [26] Hegarty K A,Weissel J K,Mutter J C.Subsidence history of Australia's southern margin:Constraints on Basin Models[J].AAPG Bulletin,1988,72 (5):615-635.
点击查看大图
计量
- 文章访问数: 1508
- HTML全文浏览量: 46
- PDF下载量: 872
- 被引次数: 0