天然气地球科学 ›› 2022, Vol. 33 ›› Issue (5): 708–719.doi: 10.11764/j.issn.1672-1926.2022.01.001

• 天然气地质学 • 上一篇    下一篇

准噶尔盆地盆1井西凹陷东斜坡侏罗系三工河组油气成藏特征及控制因素

费李莹1(),王仕莉1,苏昶1,刘钰2,江祖强1,杨梦云1,李勇广1,彭海军1   

  1. 1.中国石油新疆油田公司勘探开发研究院,新疆 克拉玛依 834000
    2.中国石油西部钻探工程有限公司试油公司,新疆 克拉玛依 834000
  • 收稿日期:2021-10-08 修回日期:2021-12-13 出版日期:2022-05-10 发布日期:2022-05-12
  • 作者简介:费李莹(1988-),女,山西霍州人,工程师,硕士,主要从事石油地质综合与油气勘探研究.E-mail: fliying@petrochina.com.cn.
  • 基金资助:
    中国石油天然气集团有限公司科技重大专项“准噶尔盆地天然气藏主控因素及关键技术研究与应用”(2017E-0403)

Characteristics of hydrocarbon accumulation and its controlling factors in Jurassic Sangonghe Formation in the east slope of Well Pen-1 Western Depression in Junggar Basin

Liying FEI1(),Shili WANG1,Chang SU1,Yu LIU2,Zuqiang JIANG1,Mengyun YANG1,Yongguang LI1,Haijun PENG1   

  1. 1.Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China
    2.Well Testing Company,Xibu Drilling Engineering Company Limited,CNPC,Karamay 834000,China
  • Received:2021-10-08 Revised:2021-12-13 Online:2022-05-10 Published:2022-05-12
  • Supported by:
    The Major Science and Technology Projects of China National Petroleum Corporation(2017E-0403)

摘要:

准噶尔盆地盆1井西凹陷东斜坡前哨2井在侏罗系三工河组获高产工业气流,开辟了斜坡区三工河组天然气勘探高效领域。为进一步明确该区三工河组油气藏主控因素和油气富集规律,深化三工河组油气勘探,在已钻探井基础上,综合应用岩心、实验分析和地震等资料,对三工河组油气藏类型、成藏特征和控制因素进行研究。结果表明:东斜坡侏罗系三工河组油气主要来源于盆1井西凹陷二叠系下乌尔禾组烃源岩;该区发育深、中、浅3期断裂,垂向上呈“Y”字型组合,配置关系良好,为油气从深层向浅层侏罗系运移提供了良好的输导条件,海西期大型断裂带控制了侏罗系油气的平面分布;三工河组油气藏类型为构造岩性和岩性型油气藏,受古地貌、沉积相带和断裂等因素共同控制,具有“烃源岩供烃、多期断裂接力输导、古地貌控带、凹槽控砂、断裂—砂体控藏”的成藏特征。

关键词: 准噶尔盆地, 盆1井西凹陷东斜坡, 三工河组, 成藏特征, 控制因素

Abstract:

High production of industrial gas in the Jurassic Sangonghe Formation has been obtained in Well Qianshao 2 in the east slope of Well Pen-1 Western Depression, which opens an efficient field of natural gas exploration of slope area. To further determine the main controlling factors and the law of hydrocarbon enrichment, and to deepen the oil and gas exploration of Sangonghe Formation in the region, data from boreholes, cores, experimental analysis and seismology were comprehensively applied to analyze the reservoir types, accumulation characteristics and controlling factors. The study shows that the oil and gas of the Sangonghe Formation mainly migrated from the source rock in the Lower Wuerhe Formation of Permian in the Well Pen-1 Western Depression. There are three stages of faults developed in this area, the third stage faults are in the shape of “Y” in the vertical direction and have a good configuration relationship, which provide good transportation conditions for oil and gas migration from deep strata to shallow Jurassic Sangonghe Formation. The large fault zones in Hercynian Period controlled the plane distribution of Jurassic oil and gas. The reservoir types in the study area are structural-lithologic type and lithologic type, which are controlled by paleogeomorphology, sedimentary facies and faults. The model of hydrocarbon reservoir formation is characterized by “source rock supplying hydrocarbon, multi-stage faults relaying transporting, paleogeomorphology controlling belt, groove controlling sand, faults and sand body controlling reservoir”.

Key words: Junggar Basin, The east slope of Well Pen-1 Western Depression, Sangonghe Formation, Accumulation characteristic, Controlling factor

中图分类号: 

  • TE122.1

图1

盆1井西凹陷东斜坡构造位置(a)及三工河组综合柱状图(b)"

图2

盆1井西凹陷东斜坡三工河组二段油气藏类型及特征"

表1

三工河组二段储层砂体特征对比"

区块岩石学特征结构特征物性特征微观特征
粒度岩性岩屑磨圆分选孔隙度/%渗透率 /(10-3 μm2

孔隙

类型

压汞特征

孔喉

类型

莫17

井区

细中粒、

不等粒

长石岩屑砂岩凝灰岩为主

次棱角—

次圆状

中等

(5.0~17.3)

/11.7

(0.022~265)

/3.74

剩余

粒间孔

排驱压力较低,进汞和退汞效率中等—好,具有明显平台

小孔隙、

细喉道

前哨

井区

细粒、

中粒

长石岩屑砂岩凝灰岩为主次圆状中等—好

(5.0~16.2)

/12.7

(0.014~205)

/3.14

粒间孔排驱压力较低,进汞和退汞效率中等—好,具有较明显平台

小孔隙、

细喉道

图3

盆1井西凹陷东斜坡三工河组二段储层特征(a)莫17井区样品孔隙度分布图;(b)莫17井区样品渗透率分布图;(c)样品镜下铸体薄片,莫17井,4 162.54 m,J1s2,中砂岩,粒间孔,×40;(d)莫17井压汞曲线,4 157.49 m;(e)前哨井区样品孔隙度分布图;(f)前哨井区样品渗透率分布图;(g)样品镜下铸体薄片,前哨2井,3 978.24 m,J1s2,中砂岩,粒间孔,×100;(h)前哨2井压汞曲线,3 978.24 m"

表2

盆1井西凹陷东斜坡三工河组二段油气藏特征及流体性质对比"

区块中部埋深 /m压力 系数油气藏中部压力 /MPa油气藏中部温度/℃原油密度 /(g/cm3原油黏度(50 ℃) /(mPa·s)天然气相对密度甲烷含量 /%

地层水

矿化度 /(mg/L)

水型
莫17井区4 2020.9940.58104.070.860 815.450.641 287.7421 720NaHCO3
前哨井区4 0120.9938.81100.170.771 20.910.632 289.2418 785NaHCO3

图4

前哨井区三工河组二段—砂组(J1s21)流体拟合相图"

表3

盆1井西凹陷东斜坡三工河组二段天然气地球化学特征统计"

区块天然气组成C7轻烃组成/%天然气碳同位素/‰
N2/%CH4/%干燥系数正庚烷甲基环己烷二甲基环戊烷CH4C2H6C3H8
莫17井区1.9385.610.8843.2244.7812.00-36.73-26.84-25.44
前哨井区1.5490.370.9341.0144.2114.78-37.08-27.05-26.33

表4

盆1井西凹陷东斜坡三工河组二段原油地球化学特征统计"

区块原油密度/(g/cm3Pr/Phδ13C/‰γ蜡烷/C30藿烷萜烷峰型C29αα20S/(20S+20R)C29αβ/∑C29油源
莫17井区0.860 81.36-29.960.18弱上升0.520.57P2w
前哨井区0.771 21.61-29.160.15山峰型0.510.55P2w

图5

过莫107井—莫002井三工河组二段沉积相剖面(A—A’剖面位置见图1)"

图6

盆1井西凹陷东斜坡三工河组二段沉积前古地貌"

图7

盆1井西凹陷东斜坡目的层段(J1s21)沉积相平面展布"

图8

过前哨1井—前哨2井—莫011井地震地质解释剖面(B—B’剖面位置见图1)"

图9

盆1井西凹陷东斜坡油气富集带"

图10

盆1井西凹陷东斜坡油气成藏模式(C—C’剖面位置见图1)"

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