准噶尔盆地吉木萨尔凹陷芦草沟组致密油形成条件与分布规律

摘要/Abstract

摘要：

利用准噶尔盆地吉木萨尔凹陷芦草沟组地质、试油、录井、岩石薄片及地球化学等资料,研究了致密油的形成条件、分布特征及其控制因素。研究区致密油形成条件优越,烃源岩有机质丰度高、有机质类型为Ⅰ和Ⅱ型并且为低熟-成熟阶段;储层岩性复杂,甜点段平面连续性好,孔隙类型多样;广泛分布的烃源岩与储层频繁互层,烃源岩生成的油气直接进入相邻储层,有利于致密油的富集;芦草沟组超压广泛发育,是致密油运移的主要动力。致密油纵向上分布受优质烃源岩控制,全段均见油气显示,主要富集于优质烃源岩层附近的储层中;平面上受烃源岩有机质丰度、烃源岩厚度及储层厚度的综合控制,主要分布于烃源岩厚度大于200 m、TOC高于3.5%、储层厚度大于15 m的区域之内。

关键词: 致密油, 形成条件, 分布规律, 芦草沟组, 吉木萨尔凹陷

Abstract:

Based on the data sets of geology, oil production test, logging, rock thin section and geochemistry of Permian Lucaogou Formation (LCG) in the Jimsar Sag of Junggar Basin, we studied the formation and distribution of tight oil. LCG source rocks are excellent level with high total organic carbon and Ⅰ, Ⅱ type kerogens, containing low mature to mature organic matter. The sweet spot sections are large in total thickness, good in continuity, with a variety of lithology. The source rocks and tight reservoirs are widely distributed and form an optimal source-reservoir-caprock combination through space and time, which are beneficial to tight oil accumulation. The abnormal overpressure in LCG provided a drive force for tight oil migration and charging. The excellent level source rocks, reservoirs, optimal source-reservoir-caprock combination, and abnormal overpressure are key factors to tight oil formation. There is oil show in the whole LCG and the tight oil is mainly accumulated in reservoirs related to excellent level source rocks in vertical. The tight oil is mainly distributed in the areas with thick source rocks (>200 m), high TOC (>3.5%) and thick reservoirs (>15 m), and controlled by source rocks and reservoirs in plane.

Key words: tight oil, formation factor, distribution, Lucaogou Formation, Jimsar Sag

中图分类号:

TE122.3

曲江秀, 艾热提·吾甫尔, 查明, 陈洪, 丁修建, 高长海, 苏阳, 廉欢, 赖仁. 准噶尔盆地吉木萨尔凹陷芦草沟组致密油形成条件与分布规律[J]. 现代地质, 2017, 31(01): 119-128.

QU Jiangxiu, AIRETI Wufuer, ZHA Ming, CHEN Hong, DING Xiujian, GAO Changhai, SU Yang, LIAN Huan, LAI Ren. Formation and Distribution of Tight Oil of Permian Lucaogou Formation in the Jimsar Sag of Junggar Basin, Northwestern China[J]. Geoscience, 2017, 31(01): 119-128.

图/表 10

图1 准噶尔盆地吉木萨尔凹陷芦草沟组致密油勘探成果图

Fig.1 Map of tight oil exploration results of Lucaogou Formation in the Jimsar Sag, Junggar Basin

图2 准噶尔盆地吉木萨尔凹陷吉174井芦草沟组地层柱状图

Fig.2 Generalized stratigraphic column of Lucaogou Formation of J174 Well in the Jimsar Sag, Junggar Basin

图3 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩TOC与S1+S2关系图

Fig.3 Relationship between TOC and S1+S2 of source rocks of Lucaogou Formation in the Jimsar Sag, Junggar Basin

图4 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩干酪根元素分析图解

Fig.4 Variation of atomic ratios for kerogen samples of Lucaogou Formation in the Jimsar Sag, Junggar Basin

图5 吉木萨尔凹陷芦草沟组甜点段厚度平面分布图((a)上甜点段;(b)下甜点段)

Fig.5 Thickness distribution of sweet spot sections in Lucaogou Formation of the Jimsar Sag, Junggar Basin

图6 准噶尔盆地吉木萨尔凹陷芦草沟组储层孔隙类型 (a)吉174井,3 140.99 m,原生粒间孔及微裂缝;(b)吉31井,2 850.6 m,长石溶孔;(c)吉174井,3 319.81 m,白云石粒内溶孔;(d)吉176井,3 037.57 m,黏土矿物间的狭缝形孔、楔形孔;(e)吉174井,3 308.45 m,微裂缝;(f)吉34井,3 686.35 m,有机质孔(长条形);(g)吉251井,3 595.15 m,有机质孔(圆形);(h)吉31井,2 725.9 m,有机质微裂缝

Fig.6 Pore types in the reservoirs of Lucaogou Formation in the Jimsar Sag, Junggar Basin

图7 吉木萨尔凹陷芦草沟组油藏剖面图(剖面位置见图1)

Fig.7 Profile of reservoir distribution of Lucaogou Formation in the Jimsar Sag, Junggar Basin

图8 准噶尔盆地吉木萨尔凹陷芦草沟组烃源岩与致密油分布((a)烃源岩厚度;(b)烃源岩TOC)

Fig.8 Source rocks and tight oil distribution of Lucaogou Formation in the Jimsar Sag, Junggar Basin

图9 准噶尔盆地吉木萨尔凹陷芦草沟组储层物性与含油级别

Fig.9 Relationship between reservoir physical property and oil bearing grade of Lucaogou Formation in the Jimsar Sag, Junggar Basin

图10 准噶尔盆地吉木萨尔凹陷芦草沟组裂缝烃类包裹体荧光特征 (a)吉174井,3 328.34 m;(b)吉174井,3 328.34 m;(c)吉34井,3 784.49 m;(d)吉34井,3 784.85 m

Fig.10 Fluorescent characteristics of hydrocarbon inclusions in fractures of Lucaogou Formation in the Jimsar Sag, Junggar Basin

参考文献 18

[1]	HILLR J, ZHANG E, KATZ B J, et al. Modeling of gas generation from the Barnett Shale, Fort Worth Basin, Texas[J]. AAPG Bulletin, 2007, 91(4): 501-521. DOI URL
[2]	MILLER B, PANEITZ J, MULLEN M. The successful application of a compartmental completion technique used to isolate multiple hydraulic fracture treatments in horizontal Bakken Shale Wells in North Dakota[J]. SPE 116469,2008.
[3]	MULLEN J. Petrophysical characterization of the Eagle Ford Shale in South Texas[J]. CSUG/SPE138145,2010.
[4]	USGS. Assessment of Undiscovered Oil Resources in the Devonian-Mississippian Bakken Formation, Williston Basin Province, Montana and North Dakota[M]. Reston,Virginia:USGS, 2008:2008-3021.
[5]	邹才能, 陶士振, 侯连华, 等. 非常规油气地质[M]. 北京: 地质出版社, 2011:70-80.
[6]	王震亮. 致密岩油的研究进展、存在问题和发展趋势[J]. 石油实验地质, 2013, 35(6):587-595.
[7]	邹才能. 国家重点基础研究发展计划(973计划)“中国陆相致密油(页岩油)形成机理与富集规律基础研究”开题报告[R]. 北京: 中国石油勘探开发研究院, 2014.
[8]	贾承造, 邹才能, 李建忠, 等. 中国致密油评价标准、主要类型、基本特征及资源前景[J]. 石油学报, 2012, 33(3):343-350. DOI
[9]	匡立春, 胡文瑄, 王绪龙, 等. 吉木萨尔凹陷芦草沟组致密油储层初步研究:岩性与孔隙特征分析[J]. 高校地质学报, 2013, 19(3):529-535.
[10]	周鹏. 新疆吉木萨尔凹陷二叠系芦草沟组致密油储层特征及储层评价[D]. 西安: 西北大学, 2014.
[11]	赵霞飞, 赵永胜, 邓启予, 等. 准噶尔盆地南缘上二叠统芦草沟组和红雁池组层序地层学初析[J]. 成都理工学院学报, 1994, 21(3): 112-120.
[12]	张建, 刘楼军, 黄芸, 等. 准噶尔盆地吉木萨尔凹陷中-上二叠统沉积相特征[J]. 新疆地质, 2003, 21(4): 412-414.
[13]	彭雪峰, 汪立今, 姜丽萍. 准噶尔盆地东南缘二叠系芦草沟组沉积环境分析[J]. 新疆大学学报, 2011, 28(4): 395-400.
[14]	匡立春, 唐勇, 雷德文, 等. 准噶尔盆地二叠系咸化湖相云质岩致密油形成条件与勘探潜力[J]. 石油勘探与开发, 2012, 39(6):657-667.
[15]	匡立春, 孙中春, 欧阳敏, 等. 吉木萨尔凹陷芦草沟组复杂岩性致密油储层测井岩性识别[J]. 测井技术, 2013, 37(6):638-642.
[16]	斯春松, 陈能贵, 余朝丰, 等. 吉木萨尔凹陷二叠系芦草沟组致密油储层沉积特征[J]. 石油实验地质, 2013, 35(5):528-533.
[17]	李红南, 毛新军, 胡广文, 等. 准噶尔盆地吉木萨尔凹陷芦草沟组致密油储层特征及产能预测研究[J]. 石油天然气学报, 2014, 36(10):40-44.
[18]	马剑, 黄志龙, 高潇玉, 等. 新疆三塘湖盆地马朗凹陷条湖组凝灰岩油藏油源分析[J]. 现代地质, 2015, 29(6):1435-1443.