THE CHARACTERISTICS AND CONTROLLING FACTORS OF THE SURFACE OIL AND GAS GEOCHEMICAL ANOMALY IN THE ORDOS BASIN
-
摘要: 通过对鄂尔多斯盆地地球化学背景特征的系统研究,并与我国主要含油气盆地的地球化学特征进行比较,认为该盆地整体上具中高背景、较均匀地化场特征。综合研究表明:鄂尔多斯盆地地球化学背景和异常的形成是各种地质作用和近地表沉积物性质、地形地貌景观条件综合作用的结果,其中油气源是地表化探指标浓度变化和异常形成的物质基础,是地表油气化探异常形成的主控因素,但不同的来源具有不同的组分特征和异常组合特征;构造运动是烃类离开油气源区,向储集层运移和纵向运移的主要动力,不同的圈闭类型对地表化探异常的组合形式或异常模式起着控制作用;而近地表沉积物性质和地形地貌景观条件是影响油气化探异常分布规律和油气化探应用效果的重要因素。Abstract: Based on the abundant actual data and the joint mapping of these data,the authors systematically studied the characteristics of the geochemical background of the Ordos Basin,and compared the geochemical background values of this basin with those of the main petroliferous basins in China.The results show that the Ordos Basin is characterized by middle to high geochemical background values,and relatively even geochemical field among the main petroliferous basins in China.Comprehensive research result shows that the formation of the background and the anomaly within the basin is the results of the combined reactions of various underground geological conditions,various near-surface sedimentary features and various landscapes.Of witch,oil and gas source is the material basis for the formation of the changes in the near-surface concentration of the geochemical indicators,and acts as the main controlling factor for the formation of the near-surface oil and gas geochemical anomaly.Oil and gas from different sources have different compositional characteristics and can cause different near-surface anomaly combinations.The study also shows that the tectonic movement is the main drive force for oil and gas to migrate vertically and laterally from the source rocks to the reservoirs,the difference in trap types plays a controlling role in the near-surface anomaly combination form or anomaly pattern,while the near-surface sedimentary characteristics and the landscape conditions play an important role in affecting the anomaly distribution regularity and the application effects in near-surface oil and gas geochemical exploration.
-
[1] 何自新.鄂尔多斯盆地演化与油气[M].北京:石油工业出版社,2003 [2] 陈全红,李文厚.鄂尔多斯盆地西南部上古生界油气成藏条件分析[J].石油实验地质,2007,29(6):554~559 [3] 杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社,2002 [4] 罗月明,刘伟新,谭学群等.鄂尔多斯大牛地气田上古生界储层成岩作用评价[J].石油实验地质,2007,29(4):384~390 [5] 程同锦.烃类运移的近地表显示与地球化学勘探[M].北京:石油工业出版社,1999 [6] 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 [7] 刘崇禧.中国油气化探40年[M].北京:地质出版社,2001 [8] 费琪.油气勘探中的创造性思维[M].北京:地震出版社,2005 [9] 赵克斌,孙长青.中国主要含油气盆地地球化学场特征[J].石油与天然气地质,2005,26(4):427~432 [10] 赵克斌,孙长青.鄂尔多斯盆地中部油气聚集带地球化学特征[J].地质与勘探,2003,39(6):46~48 [11] 陈浙春,汤玉平.戈壁区油气化探方法有效指标参数研究[J].石油实验地质,2008,30(5):532~536 [12] 阮天健,费琪.石油天然气地球化学勘探[M].武汉:中国地质大学出版社,1992 [13] 李良,袁志强.鄂尔多斯盆地北部上古生界天然气聚集规律[J].石油与天然气地质,2000,21(3):268~271,282
点击查看大图
计量
- 文章访问数: 1251
- HTML全文浏览量: 35
- PDF下载量: 893
- 被引次数: 0