二连盆地东北部下白垩统烃源岩有机相与生烃特征

doi:10.7657/XJPG20180402

›› 2018, Vol. 39 ›› Issue (4): 1-1.doi: 10.7657/XJPG20180402

• 论文 •

二连盆地东北部下白垩统烃源岩有机相与生烃特征

程志强1，王飞宇1，江涛2，任利兵1，吴子强1，谢红3

(1.中国石油大学地球科学学院,北京 102249;2.中国石油华北油田分公司勘探开发研究院,河北任丘 062552;3.中国石油渤海钻探工程公司第二录井公司,河北任丘 062552)

出版日期:2019-01-01 发布日期:1905-07-17

Organic Facies and Hydrocarbon Generation Characteristics of Lower Cretaceous Source Rocks in Northeastern Erlian Basin

CHENG Zhiqiang1, WANG Feiyu1, JIANG Tao2, REN Libing1, WU Ziqiang1, XIE Hong3

(1.School of Geosciences, China University of Petroleum, Beijing 102249, China; 2.Research Institute of Exploration and Development, Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China; 3.No. 2 Mud Log Company, Bohai Drilling Engineering Company Limited, CNPC, Renqiu, Hebei 062552, China)

Online:2019-01-01 Published:1905-07-17

摘要/Abstract

摘要： 巴音都兰凹陷与乌里雅斯太凹陷位于二连盆地东北端，相距仅30 km，但两凹陷烃源岩有机相类型存在较大差异：巴音都兰凹陷烃源岩主体为C相，初始氢指数为400~800 mg/g，平均为600 mg/g，烃源岩有机显微组分主要为腐泥组，形成于水体分层的微咸水—淡水还原环境；乌里雅斯太凹陷烃源岩为D/E相，初始氢指数为200~400 mg/g，平均为333 mg/g，烃源岩形成于淡水偏氧化沉积环境，有机显微组分主体为腐泥组、壳质组和镜质组混合型。烃源岩有机相决定生油特征，两凹陷烃源岩在生烃特征方面具有显著差异：主要表现为巴音都兰凹陷原油具有较高含硫量与总胶质量，原油API为15°~30°；而乌里雅斯太凹陷南洼原油API为35°~45°，原油油质较轻。烃源岩有机相差别也造成生烃门限差异：乌里雅斯太凹陷南洼烃源岩主体成熟度比巴音都兰凹陷烃源岩成熟度高；巴音都兰凹陷生烃门限深度为1 500~1 600 m，而乌里雅斯太凹陷南洼生烃门限深度为1 900~2 000 m，比二连盆地其他富油凹陷的生烃门限更深。D/E相烃源岩与典型C相烃源岩（以层状藻和结构藻为主）具有不同的生烃特征，D/E相烃源岩生排烃温度更高，同时排出原油以轻质油为主。

Abstract: Bayindulan sag and Wuliyasitai sag are located in the northeastern Erlian basin with only 30 km apart. However, there are great differences in organic facies between the source rocks of the two sags. The source rock of Bayindulan sag is dominated by organic facies C with the initial hydrogen index ranging from 400 to 800 mg/g, averaging 600 mg/g, and the source rock was formed in a brackish to fresh water, reduction environment with the organic maceral dominated by sapropelinite. The source rock of Wuliyasitai sag is dominated by organic facies D/E with the initial hydrogen index ranging from 200 to 400 mg/g, averaging 333 mg/g and the source rock was formed in a fresh water, oxidation environment with the organic maceral dominated by sapropelinite, exinite and vitrinite. The organic facies of source rocks can determine hydrocarbon generation characteristics. The hydrocarbon generation features of the source rocks in the 2 sags are significantly different. The crude oil of Bayindulan sag has relatively high sulfur content and asphaltenes plus resin content with the API of 15°~30°; while the API for the crude oil of Wuliyasitai sag ranges from 35° to 45° and the oil is classified as light oil. The differences of organic facies of source rocks will result in the differences of hydrocarbon generation threshold. The source rock maturity of the southern subsag of Wuliyasitai sag is higher than that of Bayindulan sag; and the threshold depth of hydrocarbon generation in Bayindulan sag is 1 500~1 600 m, whereas that of the southern subsag of Wuliyasitai sag is 1 900~2 000 m, which is deeper than those of other hydrocarbon-rich sags in Erlian basin. There are significantly different hydrocarbon generation characteristics between the source rocks of organic facies D/E and typical organic facies C (dominated by lamalginite and telalginite), the source rock of the organic facies D/E has higher hydrocarbon generation and expulsion temperatures and mainly expels light oil

中图分类号:

TE112.113

程志强1，王飞宇1，江涛2，任利兵1，吴子强1，谢红3. 二连盆地东北部下白垩统烃源岩有机相与生烃特征[J]. , 2018, 39(4): 1-1.

CHENG Zhiqiang1, WANG Feiyu1, JIANG Tao2, REN Libing1, WU Ziqiang1, XIE Hong3. Organic Facies and Hydrocarbon Generation Characteristics of Lower Cretaceous Source Rocks in Northeastern Erlian Basin[J]. , 2018, 39(4): 1-1.

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二连盆地东北部下白垩统烃源岩有机相与生烃特征

Organic Facies and Hydrocarbon Generation Characteristics of Lower Cretaceous Source Rocks in Northeastern Erlian Basin

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