石油与天然气地质 ›› 2004, Vol. 25 ›› Issue (4): 400-407,421.doi: 10.11743/ogg20040407

• 油气地质 • 上一篇    下一篇

文留地区石炭-二叠纪煤系生烃史及生烃潜力

许化政, 周新科   

  1. 中国石化石油勘探开发研究院,北京 100083
  • 收稿日期:2004-06-02 出版日期:2004-08-25 发布日期:2012-01-16
  • 基金资助:

    中国石化科技项目"中国石化环渤海湾地区前第三系油气资源前景"(P03076)

Hydrocarbon-generating potential and history of Carboniferous-Permian coal measure strata in Wenliu area

Xu Huazheng, Zhou Xinke   

  1. Exploration & Production Research Institute, SINOPEC, Beijing
  • Received:2004-06-02 Online:2004-08-25 Published:2012-01-16

摘要:

东濮凹陷文留地区石炭-二叠纪煤系分布稳定、含有机质丰富,是文留气藏可靠的气源岩。煤系在埋藏过程中有两次生烃过程:第一次发生在中、下三叠统沉积后,镜质体反射率(Ro)、磷灰石裂变径迹、古流体包裹体分析证实当时煤系的古埋深约为3500m,古地温118℃,古演化程度为Ro=0.80%~0.85%。其后经历了中生代约180Ma以抬升剥蚀为主的历程,煤系生烃中止。早第三纪裂谷发育期间,煤系因埋深加大而进入二次生烃期,并在东营组沉积后达到生烃峰值阶段。主体烃源岩主要分布在文东-前梨园洼陷,埋深5290~6360m。文留地区天然气资源探明程度已达到90%以上,有效供气边界条件清楚。经计算,文留气藏有效供气区石炭-二叠纪煤系生烃量为3253.3×108m3,排烃量2657.0×108m8,天然气聚集系数为5.92%。

关键词: 文留气藏, 石炭-二叠纪煤系, 生烃潜力, 一次生烃, 二次生烃, 聚集系数

Abstract:

The Carboniferous-Permian coal measure strata in Dongpu sag is a fair source rock unit of Wenliu gas pool due to its stable distribution and high organic content. There are two hydrocarbon-generating periods in the burial history of coal measures. The first one occurs when the T1-2 formation is deposited. Vitrinite reflectance, apatite fission track and fluid inclusion analyses indicate that the burial depth of coal measures is about 3500 m, with the palaeotem-perature of 118℃ and Ro of 0.80%-0.85%.Hydrocarbon generation of coal measures was interrupted in the Meso-zoic uplift and erosion period (about 1.8 million years).During the Paleogene rifting period,the coal measures was entered into its secondary hydrocarbon-generating period as the burial depth increases, reaching its hydrocarbon-generating peak after the deposition of Dongying formation. The gas-prone source rock is mainly distributed in the region of Wendong-Qianliyuan, with the buried depth of 5290-6360m. The discovery maturity (percentage of ultimately proven reserve with respect to total resources) of gas resources in Wenliu area is more than 90%. In the effective gas supply area of Wenliu gas pool, the hydrocarbon-generating volume and hydrocarbon-expelling volume of Carboniferous-Permian coal measures are estimated to be 3253.3 million m3 and 2657.0 million m3 respectively, with a gas accumulation coefficient of 5.92%.

Key words: Wenliu gas pool, Carboniferous-Penman coal measures, hydrocarbon-generating potential, first hydrocarbon-generating period, secondary hydrocarbon-generating period, accumulation coefficient

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