Relationship between reservoir bitumen and hydrocarbon migration in Dabei region, Kuqa Foreland Basin
-
摘要: 根据储层沥青的显微特征、热演化程度和生物标志化合物系统分析,对库车前陆盆地大北地区的储层沥青成因及油气运聚过程进行了探讨。大北地区库姆格列木群盐下砂岩储层显微裂缝中观测到少量黑色胶质沥青,其中,大北202井储层沥青发育2组,其反射率值分别为1.07%和0.47%,吐北1井储层中只检测到一组沥青,且含量极少,反射率值为0.43%;储层固体沥青为不同源、不同期的油、气混合沉淀而成。由此推断,大北地区天然气并非原油裂解成因;大北1和大北2等盐下圈闭至少发生了3期油气充注,其古油藏原油大多沿北部克拉苏逆冲断层进入浅部砂层,再汇聚于大宛齐背斜成藏;位于该断层附近的吐北1井,其储层沥青的存在说明其砂岩层是油气运移的通道,不排除该断块高部位有油气成藏的可能性。该结论对认识克拉苏构造带天然气成因和促进古油藏勘探具有重要意义。Abstract: Based on systematic analyses of microscopic characteristics, thermal maturation and biomarker compounds of reservoir bitumen, it was discussed in this paper the bitumen origin as well as the hydrocarbon migration and accumulation in Dabei region of the Kuqa Foreland Basin. A little black resin bitumen was observed in microscopic fractures of sandstone reservoir under salt bed of the Kumugeliemu Group in Dabei region. 2 groups of bitumen were found in well Dabei202, with reflectivity of 1.07% and 0.47%. 1 group of bitumen was found in well Tubei1, with reflectivity of 0.43%, and its content was very rare. Solid bitumen in reservoir was the result of mixed precipitation of oil and gas of different origin and stage. Therefore, natural gas in Dabei region is not originated from crude oil cracking. At least 3 stages of hydrocarbon charging took place in under-salt traps such as Dabei1 and Dabei2. Crude oil in ancient reservoir migrated into shallow sandstone along the Kelasu thrust fault in the north, and then accumulated in the Dawanqi anticline. Reservoir bitumen was found in well Tubei1 near the Kelasu thrust fault, indicating that sandstone worked as the pathway for hydrocarbon migration. Hydrocarbon might accumulate in the higher part of the fault block. The research illustrated the origin of natural gas in the Kelasu structural belt, and might guide ancient reservoir exploration in the region.
-
[1] 李剑,谢增业,李志生,等.塔里木盆地库车坳陷天然气气源对比[J].石油勘探与开发,2001,28(5):29-32,41. [2] 赵孟军,卢双舫,李剑.库车油气系统天然气地球化学特征及气源探讨[J].石油勘探与开发,2002,29(6):4-7. [3] 范明,黄继文,陈正辅.塔里木盆地库车坳陷烃源岩热模拟实验及油气源对比[J].石油实验地质,2009,31(5):518-521. [4] 张殿伟,刘文汇,郑建京,等.氩同位素用于库车坳陷天然气主力气源岩判识[J].地球化学,2005,34(4):405-409. [5] 杜治利,王飞宇,张水昌,等.库车坳陷中生界气源灶生气强度演化特征[J].地球化学,2006,35(4):419-431. [6] 赵孟军,张宝民.库车前陆坳陷形成大气区的烃源岩条件[J].地质科学,2002,37(增刊):35-44. [7] 付晓飞,宋岩,吕延防,等.塔里木盆地库车坳陷膏盐质盖层特征与天然气保存[J].石油实验地质,2006,28(1):25-29. [8] 刘德汉,肖贤明,田辉.等.应用流体包裹体和沥青特征判别天然气的成因[J].石油勘探与开发,2009,36(3):375-382. [9] 蔡勋育,朱扬明,黄仁春.普光气田沥青地球化学特征及成因[J].石油与天然气地质,2006,27(3):340-347. [10] 赵孟军,张水昌,刘丰忠.油藏演化的两个极端过程[J].石油勘探与开发,2003,30(5):21-23. [11] 肖中尧,黄光辉,卢玉红,等.库车坳陷却勒1井原油的重排藿烷系列及油源对比[J].石油勘探与开发,2004,31(2):35-37. [12] 朱战军,袁井菊,林壬子.等.文留油田25东区块沥青垫地球化学特征及成因[J].石油勘探与开发,2006,33(6):677-681. [13] 杨永才,张枝焕.高蜡凝析油或轻质油的分布特征与成因机理[J].地质科技情报,2005,24(3):55-59. [14] 贾望鲁,彭平安.凝析油充注对油藏沥青质分子结构的影响[J].石油勘探与开发,2003,30(6):112-116. [15] 何光玉,卢华夏,王良书,等.库车盆地烃源岩特征及生烃史特征[J].煤炭学报,2002,27(6):570-574. [16] 李谦,王飞宇,孔凡志,等.库车坳陷恰克马克组烃源岩特征[J].石油天然气学报(江汉石油学院学报),2007,29(6):38-42. [17] 汪新,贾承造,杨树锋,等.南天山库车冲断褶皱带构造变形时间:以库车河地区为例[J].地质学报,2002,76(1):55-63. [18] 邬光辉,罗春树,胡太平,等.褶皱相关断层:以库车坳陷新生界盐上构造层为例[J].地质科学,2007,42(3):496-505. [19] 赵林,秦胜飞.库车坳陷天然气藏成藏条件分析[J].石油实验地质,1999,21(4):307-310. [20] 李振生,刘德良.塔里木北部库车地区的断层系统及其对油气的控制作用[J].地质科学,2009,44(1):26-34. -
计量
- 文章访问数: 3218
- HTML全文浏览量: 73
- PDF下载量: 963
- 被引次数: 0
下载:
苏公网安备32021102000780号