岩性油气藏 ›› 2025, Vol. 37 ›› Issue (3): 1–12.doi: 10.12108/yxyqc.20250301

• 地质勘探 • 上一篇    

开鲁盆地陆东凹陷白垩系九佛堂组油气连续成藏条件

户昶昊1,2, 裴家学1, 蔡国钢1   

  1. 1. 中国石油辽河油田公司 勘探开发研究院, 辽宁 盘锦 124010;
    2. 中南大学 地球科学与信息物理学院, 长沙 410083
  • 收稿日期:2024-11-14 修回日期:2025-01-01 发布日期:2025-05-10
  • 第一作者:户昶昊（1979—），男，中南大学在读博士研究生，教授级高级工程师，主要从事油田勘探开发工作。地址：（124010）辽宁省盘锦市兴隆台区石油大街95号辽河油田勘探开发研究院。Email：huch6@petrochina.com.cn。
  • 基金资助:
    辽河油田重大科技专项“开鲁复杂低渗油藏增储上产关键技术研究”（编号：2024KJZX-06），新型油气勘探开发国家重大科技专项“渤海湾超级盆地油气富集规律与新领域勘探技术”（编号 2024ZD14001）联合资助。

Hydrocarbon continuous accumulation conditions of Cretaceous Jiufotang Formation in Ludong Sag，Kailu Basin

HU Changhao1,2, PEI Jiaxue1, CAI Guogang1   

  1. 1. Research Institute of Exploration and Development, PetroChina Liaohe Oilfield Company, Panjin 124010, Liaoning, China;
    2. School of Geosciences and Info-physics, Central South University, Changsha 410083, China
  • Received:2024-11-14 Revised:2025-01-01 Published:2025-05-10

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摘要： 基于连续成藏理论，综合利用地震、钻井、录井、测井、岩心分析测试等资料，从构造沉积演化背景及其控制下的九佛堂组烃源岩、储层及成藏特征等多方面，对陆东凹陷九佛堂组油气成藏条件进行了系统研究，明确了连续成藏模式及勘探有利区。研究结果表明：①陆东凹陷为单断箕状凹陷，陡岸带为原始沉积的主物源供给区，缓坡带为晚期主抬升剥蚀区，现今构造保留了原沉积沉降中心主体部分；九佛堂组沉积受控凹断裂分期活动控制，在沉降速率低、水体相对浅的阶段，陡坡带发育大型扇三角洲，砂体呈“满洼充填”状态。②研究区九佛堂组发育九下段凝灰质泥岩和九上段Ⅰ—Ⅲ油组油页岩2套烃源岩，均为低成熟—成熟的好烃源岩，主力烃源岩为九上段Ⅰ—Ⅲ油组油页岩，其氯仿沥青“A”为0.48%，TOC为4.47%，总烃为2 377 mg/L，有机质类型以Ⅰ，Ⅱ1型为主，镜质体反射率为0.64%；扇三角洲前缘水下分流河道发育少量常规砂岩储层，致密砂岩储层广泛且连续分布，洼陷中心发育湖相碳酸盐岩储层；不同类型储层储集空间分层次发育，受物源供给与水体环境双重作用影响，粗粒砂岩粒间（溶）孔、细粒砂岩粒内溶孔、云质泥岩基质溶孔、碳酸盐岩溶蚀孔广泛发育；沙海组发育厚层暗色泥岩，可作区域盖层。③洼陷区源-储共生，保存条件优越，不同类型油藏连片发育，平面依次发育常规油-致密油-页岩油藏，纵向上多种类型叠置；后河扇体、交力格扇体取得了良好的勘探成效，库伦塔拉扇体、清河扇体是下步勘探有利区。

关键词: 控凹断裂, 沉降速率, 扇三角洲, 湖相碳酸盐岩, 非常规油气, 九佛堂组, 白垩系, 陆东凹陷, 开鲁盆地

Abstract: Based on the theory of continuous accumulation and the data of seismic，drilling ，master logging， well logging and core testing，the hydrocarbon accumulation conditions of Jiufotang Formation in Ludong Sag of Kailu Basin were studied from multiple aspects，including the tectonic sedimentary evolution background and its controlled source rocks，reservoirs，and reservoir characteristics of the Jiufotang Formation. The continuous accumulation patterns and favorable exploration targets in this area were clarified. The results show that：（1）Ludong Sag presents a single-fault half-graben configuration，where the steep slope zone serves as the main source supply area of the original sedimentary source，while the gentle slope zone is the main uplift and denudation area in the late stage，the main part of the original sedimentary subsidence center exists in current structure. The sedimentation of Jiufotang Formation is controlled by the staged activities of the sag-controlling fault. In the sedimentary stage with low sedimentation rate and relatively shallow water conditions，large fan deltas are developed in the steep slope zone，and the sand bodies are in the state of“pervasive sand distribution”.（2）Two source rock intervals are identified in Jiufotang Formation in the research area：tuffaceous mudstones in lower member of Jiufotang Formation and oil shales（Oil Groups Ⅰ-Ⅲ）in upper member of Jiufotang Formation，both of them are good source rocks with low maturity to maturity. The principal source rocks are the oil shales（Oil Groups Ⅰ- Ⅲ），with the chloroform bitumen‘A’of 0.48%，TOC of 4.47%，total hydrocarbon of 2 377 mg/L，organic matter type mainly consisting of type Ⅰ and Ⅱ1，and vitrinite reflectance of 0.64%. A small amount of conventional sandstone reservoirs are developed in the underwater distributary channel of the fan delta front. The tight sandstone reservoirs are widely and continuously distributed，and the lacustrine carbonate reservoirs are developed in the center of the subsag. Influenced by the effects of provenance supply and water environment，the storage space of different types of reservoirs develop sequentially. Intergranular（dissolved）pores in coarse sandstones， intragranular dissolved pores in fine sandstones，matrix dissolution pores in dolomitic mudstones，and carbonate dissolution pores are widely developed. Thick dark mudstone developed in Shahai Formation can be used as regional cap rock（. 3）The source-reservoir in the subsag area is integrated，and with superior preservation conditions. Different types of reservoirs are continuously developed. Conventional oil-tight oil-shale reservoirs are successively developed on the plane，and multiple types are superimposed vertically. Houhe and Jiaolige fan bodies have shown promising exploration results，while Kuluntala and Qinghe fan bodies are favorable areas for exploration.

Key words: sag-controlling fault, sedimentation rate, fan delta, lacustrine carbonate reservoirs, unconventional hydrocarbons, Jiufotang Formation, Cretaceous, Ludong Sag, Kailu Basin

中图分类号: 

  • TE122.1
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