海拉尔盆地中部断陷带下白垩统南屯组致密储层特征及有利区预测

doi:10.12108/yxyqc.20240412

岩性油气藏 ›› 2024, Vol. 36 ›› Issue (4): 136–146.doi: 10.12108/yxyqc.20240412

海拉尔盆地中部断陷带下白垩统南屯组致密储层特征及有利区预测

田亚, 李军辉, 陈方举, 李跃, 刘华晔, 邹越, 张晓扬

中国石油大庆油田公司勘探开发研究院, 黑龙江大庆 163712

收稿日期:2023-02-02 修回日期:2023-03-17 出版日期:2024-07-01 发布日期:2024-07-04
第一作者:田亚（1982—），女，硕士，高级工程师，主要从事致密储层与成藏方面的研究工作。地址：（163712）黑龙江省大庆市让胡路区西灵路18号大庆油田勘探开发研究院。Email：tianya@petrochina.com.cn。
通信作者: 李军辉（1981—），男，博士，高级工程师，主要从事沉积与储层方面的研究工作。Email：yjylijh@petrochina.com.cn。
基金资助:
国家科技重大专项“大庆油气持续有效发展关键技术研究与应用”（编号：2016E-0202）资助。

Tight reservoir characteristics and favorable areas prediction of Lower Cretaceous Nantun Formation in central fault depression zone of Hailar Basin

TIAN Ya, LI Junhui, CHEN Fangju, LI Yue, LIU Huaye, ZOU Yue, ZHANG Xiaoyang

Research Institute of Exploration and Development, PetroChina Daqing Oilfield Co., Ltd., Daqing 163712, Heilongjiang, China

Received:2023-02-02 Revised:2023-03-17 Online:2024-07-01 Published:2024-07-04

摘要/Abstract

摘要： 综合运用岩心分析、铸体薄片、高压压汞等资料，对海拉尔盆地中部断陷带下白垩统南屯组储层特征及其主控因素开展了详细研究，并对有利区进行了定量综合评价。研究结果表明：①海拉尔盆地中部断陷带南屯组岩石类型主要为岩屑砂岩和长石岩屑砂岩，储层孔隙度小于 12% 的样品数占总样品数的 70.2%，渗透率小于 1 mD 的样品数占总样品数的 66.3%，属于致密砂岩储层，储层储集空间主要为少量原生孔隙和大量次生溶蚀孔隙。②沉积相控制了研究区储层物性在空间上的总体分布规律，南屯组最有利的沉积相带是辫状河三角洲前缘和扇三角洲前缘亚相；压实作用对储层具有减孔效应，溶蚀作用普遍发育，形成了大量粒间和粒内溶孔，对储集性具有一定改善作用。③盆地中部断陷带发育缓坡断阶构造带、陡坡断阶构造带和洼槽带 3 种构造带，其中缓坡断阶构造带和陡坡断阶构造带为主要的油气聚集区带，其断裂的大量发育均早于或同期于烃源岩大量排烃阶段，为油气运移提供了通道。④将“沉积相-孔隙度-储层厚度-砂地比-埋藏深度”五要素进行叠合，定量评价有利储层发育区，其中Ⅰ类、Ⅱ类优质储层主要分布在盆地中部断陷带的缓坡断阶构造带和陡坡断阶构造带。

关键词: 致密储层, 辫状河三角洲前缘, 扇三角洲前缘, 缓坡断阶构造带, 陡坡断阶构造带, 南屯组, 下白垩统, 中部断陷带, 海拉尔盆地

Abstract: The data of core analysis，cast thin sections and high-pressure mercury injection were used to study the reservoir characteristics and main controlling factors of Lower Cretaceous Nantun Formation in central fault depression zone of Hailar Basin，and the favorable areas were quantitatively and comprehensively evaluated. The results show that：（1）The rock types of Nantun Formation in in central fault depression zone of Hailar Basin are mainly lithic sandstone and feldspathic lithic sandstone，with reservoir porosity less than 12% accounting for 70.2% and permeability less than 1 mD accounting for 66.3%. It belongs to the category of tight sandstone reservoir，and the reservoir space is a small number of primary pores and a large number of secondary pores.（2）The sedimentary facies control the overall spatial distribution of reservoir properties in the study area. The most favorable sedimentary facies zones of Nantun Formation are braided river delta front and fan delta front subfacies. Compaction has a pore reducing effect on the reservoir，and dissolution is generally developed，forming a large number of intergranular and intragranular dissolved pores，which has a certain improvement effect on the reservoir properties.（3）There are three types of structural belts developed in the central fault depression zone of the basin：gentle slope fault terrace structural belt，steep slope fault terrace structural belt，and trough belt. Among them，the gentle slope fault terrace structural belt and steep slope fault terrace structural belt are the main oil and gas accumulation zones，and the development of their faults is earlier than or contemporaneous with a large number of hydrocarbon expulsion stages of the source rocks，providing channels for oil and gas migration.（4）Five elements of sedimentary facies，porosity，reservoir thickness，sand to stratum ratio and burial depth were superimposed to quantitatively evaluate the favorable reservoir development areas. Among them，type Ⅰ and type Ⅱ high-quality reservoirs are mainly distributed in the gentle slope fault terrace structural belt and steep slope fault terrace structural belt in the central fault depression zone of the basin.

Key words: tight reservoir, braided river delta front, fan delta front, gentle slope fault terrace structural belt, steep slope fault terrace structural belt, Nantun Formation, Lower Cretaceous, central fault depression zone, Hailar Basin

中图分类号:

TE122.2

田亚, 李军辉, 陈方举, 李跃, 刘华晔, 邹越, 张晓扬. 海拉尔盆地中部断陷带下白垩统南屯组致密储层特征及有利区预测[J]. 岩性油气藏, 2024, 36(4): 136–146.

TIAN Ya, LI Junhui, CHEN Fangju, LI Yue, LIU Huaye, ZOU Yue, ZHANG Xiaoyang. Tight reservoir characteristics and favorable areas prediction of Lower Cretaceous Nantun Formation in central fault depression zone of Hailar Basin[J]. Lithologic Reservoirs, 2024, 36(4): 136–146.

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海拉尔盆地中部断陷带下白垩统南屯组致密储层特征及有利区预测

Tight reservoir characteristics and favorable areas prediction of Lower Cretaceous Nantun Formation in central fault depression zone of Hailar Basin

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