鄂尔多斯盆地陇东地区长7段有效烃源岩及生排烃研究

郭凯

doi:10.11781/sysydz201701015

鄂尔多斯盆地陇东地区长7段有效烃源岩及生排烃研究

doi: 10.11781/sysydz201701015

郭凯^1,2

1.
中国石油长城钻探工程有限公司解释研究中心, 北京 100101
2. 中国石油大学油气资源与探测国家重点实验室, 北京 102249

基金项目: 国家自然科学基金重点项目“致密砂岩微米—纳米级孔喉网络系统石油充注、运移和聚集机理”（41330319）资助。

详细信息

作者简介:
郭凯(1986-),男,博士,工程师,从事石油地质综合研究。E-mail:gk1228@126.com。

中图分类号: TE122.1
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出版历程
- 收稿日期: 2016-03-29
- 修回日期: 2016-11-23
- 刊出日期: 2017-01-28

Active source rocks of Chang 7 member and hydrocarbon generation and expulsion characteristics in Longdong area, Ordos Basin

Guo Kai^1,2

1.
Geoscience Centre, CNPC Greatwall Drilling Company, Beijing 100101, China
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

摘要

摘要: 通过烃源岩地球化学数据分析、测井有机碳计算、生烃潜力法及生排烃史模拟，研究了鄂尔多斯盆地陇东地区长7段有效烃源岩的分布、生排烃史及排烃强度。长7段有机碳含量大于1.0%的暗色泥岩（含油页岩）厚度主要为20~90 m，平均有机碳含量主要介于2%~9%，其有效烃源岩分布以w（TOC）=1.0%和R_o=0.7%为界限，具有大面积广覆式分布的特征；长7段有效烃源岩在侏罗纪末期开始成熟生烃，主要在早白垩世早期（140~130 Ma，R_o≈0.7%）开始排烃，至早白垩世末期（100 Ma）达到生排烃高峰（R_o≈1.0%），最大产油率接近400 mg/g，排油率达308 mg/g，晚白垩世以来的区域性构造抬升使得生烃停止；长7段有效烃源岩排烃强度主要分布于（10~250）×10⁴ t/km²，具有强排烃特征，以长6—长8段致密油为主的延长组油藏主要分布于排烃强度大于20×10⁴ t/km²的地区，油气具有近源短距离富集的特点。
- 有效烃源岩 /
- 热演化 /
- 排烃强度 /
- 延长组 /
- 三叠系 /
- 陇东地区 /
- 鄂尔多斯盆地
Abstract: The distribution, hydrocarbon generation and expulsion history and intensity of active source rocks in the Chang 7 member of the Yanchang Formation in the Longdong area of the Ordos Basin were studied based on geoche-mical data, TOC calculation by well logging, hydrocarbon generation potential and expulsion history simulation. Dark mudstone (including oil shale) thickness with an organic carbon content (w(TOC)) more than 1.0% in the Chang 7 member mainly ranges from 20-90 m, and the average w(TOC) is mainly between 2%-9%. Active source rocks of the Chang 7 member have a w(TOC) value over 1.0% and R_o value over 0.7%, and are widely distributed in the Longdong area. They became mature and generated hydrocarbon at the end of Jurassic, expelled hydrocarbon during the early stage of the Early Cretaceous (140-130 Ma,R_o≈0.7%), and reached peak at the end of the Early Cretaceous (100 Ma, R_o≈1.0%). At this time, the oil generation ratio reached 400 mg/g TOC, and the oil expulsion ratio could be 308 mg/g TOC. But oil generation was forced to stop as a result of regional tectonic uplift since the Late Cretaceous. The oil expulsion intensity is mainly (10-250)×10⁴ t/km², showing the characteristics of strong oil expulsion. Oil reservoirs of the Yanchang Formation dominated with tight oil of the Chang 6-Chang 8 members mainly developed in the area with an oil expulsion intensity over 20×10⁴ t/km², which indicated that oil accumulation in tight sandstones has characteristics of being near the oil source with a short migration distance.
- active source rock /
- thermal evolution /
- hydrocarbon expulsion intensity /
- Yanchang Formation /
- Triassic /
- Longdong area /
- Ordos Basin

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