岩性油气藏 ›› 2025, Vol. 37 ›› Issue (3): 47–58.doi: 10.12108/yxyqc.20250305

• 地质勘探 • 上一篇    

松辽盆地北部葡萄花油田白垩系泉四段源下型致密油成藏条件

冉逸轩1, 杜长鹏2, 张晶晶2   

  1. 1. 中国石油大学(华东)地球科学与技术学院, 山东 青岛 266580;
    2. 中国石油大庆油田 勘探开发研究院, 黑龙江 大庆 163712
  • 收稿日期:2024-12-24 修回日期:2025-02-05 发布日期:2025-05-10
  • 第一作者:冉逸轩（1992—），男，中国石油大学（华东）在读博士研究生，研究方向为非常规油气成藏机理。地址：（266580）山东省青岛市中国石油大学(华东)地球科学与技术学院。Email：ranyixuan92@163.com。
  • 基金资助:
    国家科技重大专项“松辽盆地致密油开发示范工程”（编号：2017ZX0071）资助。

Accumulation condition of “below the source rock” tight oil in the 4th member of Cretaceous Quantou Formation in Putaohua Oilfield， northern Songliao Basin

RAN Yixuan1, DU Changpeng2, ZHANG Jingjing2   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. Research Institute of Exploration and Development, PetroChina Daqing Oilfield, Daqing 163712, Heilongjiang, China
  • Received:2024-12-24 Revised:2025-02-05 Published:2025-05-10

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摘要： 为明确松辽盆地北部葡萄花油田白垩系泉四段源下型致密油成因和有利勘探区，通过精细刻画其烃源岩特征、输导通道、生烃增压特征和优质储层特征等，明确了不同构造单元的致密油类型及分布特征，建立了各构造单元差异化成藏模式。研究结果表明：①古龙凹陷高成熟的青一段烃源岩是葡萄花油田白垩系泉四段致密油成藏的物质基础，孔隙度大于10%的优质储层有利于致密油的富集，断层+河道砂体组成的L型输导体为油气侧向运移通道。②葡萄花油田白垩系泉四段经历了2期成藏，明水组末期的生烃增压形成了19.6～23.5 MPa的超压，使油气倒灌形成了源下型致密油。③泉四段发育断层-岩性油藏、断层油藏、砂岩透镜体型油藏和上倾尖灭型岩性油藏等4类致密油藏，茂兴向斜主要发育小型砂岩透镜体型和断层油藏，含油面积零散，头台鼻凸为上倾尖灭岩性和断层-岩性油藏，含油性较好，葡西鼻凸以断层、断层-岩性油藏为主，油气连续成片分布。④致密油成藏受生烃中心、L型输导体、超压和储层质量等因素联合控制，茂兴向斜、葡南鼻凸和头台鼻凸成藏模式分别为“上生下储、源内超压驱动、油气倒灌、局部‘甜点’富集”，“源-储紧邻、断-砂接力L型输导、高部位聚集”和“源-储分离、断-河匹配侧向运聚、优质储层富集”，葡南鼻凸为致密油有利勘探区。

关键词: 致密油, 源下型油藏, L型输导体, 超压, 上倾尖灭型岩性油藏, 泉四段, 白垩系, 葡萄花油田, 松辽盆地

Abstract: In order to clarify the genesis and favorable exploration area of“below the source rock”tight oil of the 4th member of Cretaceous Quantou Formation in Putaohua Oilfield of northern Songliao Basin，tight oil types and distribution characteristics of different structural units were identified through fine characterization for source rock characteristics，migration channels，hydrocarbon-generating pressurization，high-quality reservoir characteristics. Hydrocarbon accumulation models were established for each structural unit. The results show that： （1）High-mature source rock in the 1st member of Qingshankou Formation of Gulong Sag is the material basis for the tight oil reservoir accumulation of the 4th member of Cretaceous Quantou Formation in Putaohua Oilfield. High-quality reservoirs with porosity greater than 10% are good for the enrichment of tight oil. The “L-type” migration channels composed of faults and river sandbodies are the necessary guarantees for tight oil lateral migration. （2）The 4th member of Cretaceous Quantou Formation underwent 2 main accumulation period. The overpressure of 19.6-23.5 MPa formed by hydrocarbon-generating pressurization in late Mingshui Formation，is the main power for oil and gas to flow backward and form “below the source rock” tight oil （. 3）Four kinds of tight oil reservoirs，such as fault-lithologic oil reservoirs，fault reservoirs，sandstone lens oil reservoirs，updip pinch-out lithologic oil reservoirs，are developed in the 4th member of Quantou Formation. Maoxing syncline mainly develops small-scale sandstone lens and fault reservoirs，with scattered oil bearing areas. While Toutao nose-bulge develops updip pinchout lithologic oil and fault reservoirs，with good oil bearing. And Punan nose-bulge mainly develops fault and fault-lithologic oil reservoirs，with oil and gas continuously distributed in large expanse.（4）The accumulation of tight oil reservoir is controlled by hydrocarbon generation centers，“L-type” migration channels，overpressure and reservoir quality. The accumulation models of Maoxing syncline，Punan nose-bulge and Toutai nose-bulge are “upper-generation and lower-storage, overpressure drive within source rock，oil and gas backflow，and part ‘sweet spot’enrichment”， “source-reservoir adjoining，fault-sandstone relay L-type migration，upper aggregation”，and “source-reservoir separation，fault-river lateral migration and accumulation，and high-quality reservoir enrichment”，respectively. Punan nose-bulge is the favorable exploration area for tight oil.

Key words: tight oil, below the source rock, "L-type" migration channels, overpressure, updip pinch-out lithologic reservoir, the 4th member of Quantou Formation, Cretaceous, Putaohua Oilfield, Songliao Basin

中图分类号: 

  • TE122.3
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