ANOMALY PATTERN ORIGINS OF THE WIRE-ADSORBED HYDROCARBON INDICATORS-OVER THE JURASSIC GAS RESERVOIR OF WELL YINGNAN 2 IN THE TARIM BASIN
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摘要: 分析了塔里木盆地英吉苏凹陷英南2井侏罗系气藏特殊的封闭成藏特征及其不同的油气微渗漏方式,并对测区吸附丝轻烃指标(C2-8)、重烃指标(C15-19)地球化学场特征进行了研究,发现该气藏上方二指标的地球化学场特征、异常模式等均存在显著差异.研究认为:该气藏致密砂岩的水锁效应、气藏烃物质微渗漏方式(扩散、渗透)等因素是引起上述差异的根源;气体游离扩散相重烃物质扩散散失是气藏区上方C15-19指标异常的成因,重烃物质局部扩散系数从构造顶部高值区到构造翼部低值区的变化趋势是气藏区上方C15-19指标曲线倒"V"状特征的形成原因;未发生水锁效应气藏边缘区轻烃物质的渗透散失强于发生水锁效应气藏区轻烃物质的扩散散失,是研究区C2-8指标剖面曲线"驼峰"状特征的成因.应用该气藏上方吸附丝二指标的异常模式及组合关系对孔雀1井的钻前预测得到了后期勘探成果的有效验证,其对孔雀河古斜坡区、英吉苏致密砂岩区的油气勘探也具有借鉴意义.Abstract: A research on the causes of the anomaly patterns of the wire-adsorbed geochemical indicators over the Jurassic gas reservoir of Well Yingnan 2 in the Yingjishu Sag of the Tarim Basin has been conducted.The knowledge was gained that the water lock effect provides the favorable trapping and accumulation conditions for this gas reservoir,and the hydrocarbon gases within the reservoir can migrate upward through different ways(such as diffusion and permeation).The Jurassic gas reservoir of Well Yingnan 2 was chosen to conduct the research of the geochemical field characteristics and the anomaly patterns of the light wire-adsorbed hydrocarbon(C2-8) and the heavy wire-adsorbed hydrocarbon(C15-19) indicators.It is found that both the characteristics of the geochemical field and the anomaly patterns of the 2 kinds of indicators differ obviously from each other.The analysis results indicate that the water lock effect of the tight sandstones and the microseepage and diffusion ways of the hydrocarbons are the root causes of these differences;and the diffusion rate of the light hydrocarbons within the water-locked sandstone area in the gas reservoir is less than that within the area without water lock effect in the edge of the gas reservoir,which causes the high anomaly values of the light wire-adsorbed hydrocarbons(C2-8) in the edge of the gas reservoir and the sub-high anomaly values of these hydrocarbons in the gas reservoir area.The study also indicates that the low-content of heavy hydrocarbons in the gas reservoir and the local diffusion coefficient of the reservoir hydrocarbon gases are the geological causes of the high value anomaly of the heavy wire-adsorbed hydrocarbon indicators(C15-19) over the top of the this gas reservoir.
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Key words:
- gas reservoir /
- adsorbent wire /
- indicator /
- anomaly pattern /
- geochemical exploration /
- Jurassic /
- Yingjishu Sag /
- Tarim Basin
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[1] 程同锦,李广之,陈银节.吸附烃提取新技术及其在地表油气化探中的应用[J].石油实验地质,2007,29(2):116-119 [2] 侯镜德,张逢玉,冯建跃.吸附丝法研究油气垂直运移理论[J].化学学报,1994,52:1194-1198 [3] 阮天健,费琪.石油与天然气地球化学勘探[M].武汉:中国地质大学出版社,1992.46-52,67-83 [4] 蒋涛,夏响华,陈浙春.地球化学烃场效应的探讨及应用[J].石油实验地质,2003,25(3):290-294 [5] 蒋涛,陈银节,赵克斌等.已知油气藏上方油气化探指标的有效性分析[J].石油实验地质,2008,30(2):207-211 [6] 李红梅,夏斌,程军等.东营凹陷花沟地区CO2气藏化探指标综合评价[J].油气地质与采收率,2007,14(1):44-46 [7] 杨永才,常象春,张枝焕等.英吉苏凹陷天然气地球化学特征[J].天然气工业,2006,26(8):12-15 [8] Masters J A.Deep basin gas trap[J].AAPG Bulletin,1979,63(2):152-181 [9] Leythaeuser D.Schaefer R G.Yukler A.Role of diffusion in Primary migration of hydrocarbon[J].AAPG Bulletin,1982,66(4):408-429 [10] 金之钧,张金川,王志欣.深盆气成藏关键地质问题[J].地质论评,2003,49(4):400-407 [11] 张金亮,张金功.深盆气藏的主要特征及形成机制[J].西安石油学院学报,2001,16(1):1-7 [12] 杨晓宁,张惠良,朱国华.致密砂岩的形成机制及其地质意义[J].海相油气地质,2005,10(1):31-36 [13] 杨晓宁,王国林,张丽娟等.塔里木盆地英南2井侏罗系气藏性质[J].新疆石油地质,2003,24(3):218-220 [14] Hunt J M.Generation and migration of petroleum from abnormally pressured fluid compartment[J].AAPG Bulletin,1990,74(1):1-12 [15] 刘玉魁,胡剑风,闵磊等.塔里木盆地英吉苏凹陷成藏机理分析[J].天然气工业,2004,24(10):6-9 [16] 尹小勇,宋海华.基于扩散热能和自由体积的扩散模型[J].天津大学学报,2006,39(10):1157-1161 [17] 蒋涛,吴瑞金,程同锦等.化探技术在我国西部油气勘探中的应用探讨[J].天然气地球科学,2007,18(1):117-120 [18] 蒋涛,汤玉平,程同锦.塔北某区油气藏上方吸附丝指标异常模式研究[J].天然气工业,2003(增刊):32-34. [19] 杨铭,汤达祯,邢卫新等.塔里木盆地孔雀河古斜坡成藏条件新认识[J].石油实验地质,2007,29(3):275-279 [20] 张丽娟,顾乔元,邸宏利等.英吉苏地区致密砂岩盖层形成机理及其分布预测[J].中国石油勘探,2003,8(4):24-28 -
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