塔北新和地区下白垩统亚格列木组源-汇体系分析及沉积模式
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郝建龙(1983—),男,内蒙古鄂尔多斯人,工程师,硕士,从事石油地质研究工作。E-mail:haojianlong89@126.com。

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Source-sink system analysis and sedimentary model of Cretaceous Yageliemu Formation in Xinhe area, northern Tarim Basin
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    摘要:

    隐蔽岩性圈闭是目前塔里木盆地深层碎屑岩油气勘探的重要领域。碎屑岩有利储集体的地质分布模式是制约高效勘探开发的关键难题。目前塔里木盆地北部(塔北)新和地区下白垩统亚格列木组深层储层油气勘探取得重要进展,但受钻井数量限制,亚格列木组储层展布规律亟待进一步落实。以塔北新和古隆起及北部断坡带为例,应用岩心分析、地震反射结构识别、古地貌恢复与渠道刻画、地震反演约束等预测方法,基于源-汇体系理论分析亚格列木组物源区、沉积物输送渠道、扇三角洲平面及剖面展布特征。研究结果表明,塔北新和地区亚格列木组发育扇三角洲沉积;基于源-汇体系分析,明确新和扇三角洲沉积物源来自于新和古隆起,多支下切水道发育为扇三角洲沉积提供了有效输送通道。西南部的W1井区上游发育浅且窄的顺直型小流域面积沟谷,下切沟谷发育较小规模的扇三角洲沉积,具有早期不发育、晚期发育的特点。东北部的W2井区上游发育宽且深的多支流大流域面积沟谷体系,发育较大规模的扇三角洲沉积,具有早期发育规模较大,晚期退积发育、早晚期扇体叠置的特征。

    Abstract:

    Subtle lithologic traps are essential fields for oil and gas exploration in deep clastic rocks of Tarim Basin. The geological distribution pattern of favorable reservoirs in clastic rocks is a key challenge restricting efficient exploration and development.At present,breakthroughs in oil and gas exploration have been made in the deep reservoirs of the Lower Cretaceous Yageliemu Formation in Xinhe area of the northern Tarim Basin. In view of the limitation of wells,the distribution pattern of reservoirs in Yageliemu Formation urgently needs to be further clarified. This study took the plaeo uplift in Xinhe area of the northern Tarim Basin and the northern fault slope zone as examples and used prediction methods such as core analysis,seismic reflection identification,paleogeomorphology restoration,channel characterization,and seismic inversion constraint. Based on the theory of the source-sink system,the distribution characteristics of the source area,sediment transport channel,and fan delta in Yageliemu Formation on the plane and profile were analyzed. The research results indicated that fan delta sediments are developed in Yageliemu Formation in Xinhe area of the northern Tarim Basin. The sediment source of the fan delta in Xinhe area comes from the plaeo uplift in Xinhe area,and the development of multi-tributary incised valleys provides effective transportation channels for the fan delta sediments. The upstream area of Well W1 region in the southwest is characterized by shallow,narrow,straight,and small watershed area valleys. The small-sized fan delta sediments are developed in the incised valleys and feature late development. Well W2 region in the northeast has a wide,deep,multi-tributary,and large watershed area valley system in the upstream,with large-sized fan delta sediments developed,featuring large-scale early development,late regressive development,and early and late fan superposition.

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郝建龙,杨玉芳,李 帅,张 莉,孟璐莹,毕小龙,杨沁超.塔北新和地区下白垩统亚格列木组源-汇体系分析及沉积模式[J].油气地质与采收率,2025,32(3):58~67

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  • 收稿日期:2023-12-25
  • 最后修改日期:2024-11-19
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  • 在线发布日期: 2025-06-19
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