天然气地球科学 ›› 2022, Vol. 33 ›› Issue (3): 333–343.doi: 10.11764/j.issn.1672-1926.2021.10.019

• 天然气地质学 •    下一篇

川西地区雷口坡组四段天然气成藏特征及勘探前景

王国力1,2(),宋晓波3,刘勇3,孟宪武3,隆轲3   

  1. 1.中国石化西南油气分公司,四川 成都 610041
    2.中国石化西南油气分公司地质中心实验室,四川 成都 610081
    3.中国石化西南油气分公司勘探开发研究院,四川 成都 610041
  • 收稿日期:2021-08-06 修回日期:2021-10-19 出版日期:2022-03-10 发布日期:2022-03-22
  • 作者简介:王国力(1965-),男,内蒙古赤峰人,教授级高级工程师,博士,主要从事油气勘探研究与管理工作. E-mail:wangguoli.xnyq@sinopec.com.
  • 基金资助:
    中国石化科技攻关项目“西南探区天然气富集规律与目标评价”(P20059-3)

Natural gas accumulation characteristics and exploration prospects of the 4th member of Leikoupo Formation in the western Sichuan Basin

Guoli WANG1,2(),Xiaobo SONG3,Yong LIU3,Xianwu MENG3,Ke LONG3   

  1. 1.Southwest Branch Company,SINOPEC,Chengdu 610041,China
    2.Geological Central Laboratory of Southwest Branch Company,SINOPEC,Chengdu 610081,China
    3.Exploration and Development Research Institute of Southwest Branch Company,SINOPEC,Chengdu 610041,China
  • Received:2021-08-06 Revised:2021-10-19 Online:2022-03-10 Published:2022-03-22
  • Supported by:
    The Science and Technology Projects of SINOPEC(P20059-3)

摘要:

中三叠统雷口坡组是四川盆地西部近年来海相天然气勘探的热点层系之一,业内对其成藏条件和气藏类型的认识存在较大分歧。研究表明,川西地区雷口坡组四段油气成藏条件优越,潮坪相白云岩储层大规模稳定展布,二叠系和中三叠统雷口坡组2套烃源岩发育。雷四段在川西坳陷由西向东发育3种成藏模式,即跨层烃源断裂+裂缝复合输导的下生上储式构造气藏,小型烃源断裂+层内裂缝“接力式”输导的下生上储式构造—地层气藏,以及层内裂缝输导的自生自储式岩性气藏。除了目前已获得超千亿方探明储量的川西龙门山前雷四段构造气藏外,坳陷东侧雷口坡组四段尖灭线附近为探索构造—地层气藏的有利区域,坳陷东侧斜坡带中下部(广汉斜坡带)是探索岩性气藏的有利区域。

关键词: 雷口坡组四段, 成藏特征, 川西地区, 勘探前景

Abstract:

The Leikoupo Formation of the Middle Triassic is one of the hot strata of marine natural gas exploration in western Sichuan Basin in recent years. The petroleum geologists have different opinions on the reservoir-forming conditions and the types of gas pools. The research shows that the 4th member of the Leikoupo Formation in the western Sichuan Basin has favorable hydrocarbon accumulation conditions. It not only has a large scale stable distribution of tidal flat dolomite reservoir, but also develops two sets of source rocks: the Permian source rock and the Leikoupo Formation source rock. There are three models of hydrocarbon accumulation in the 4th member of Leikoupo Formation from west to east in the western Sichuan Depression, namely, the “lower generation and upper reservoir” structural gas reservoir transported by cross-layer source faults and fractures, the “lower generation and upper reservoir” structure-formation gas reservoirs transported by the relay combination of small source faults and intra-layer fractures, and the “self-generating and self-storage” lithologic gas reservoir transported by intra-layer fractures. After the proved reserves of 100 billion cubic meters of structural gas reservoir in the 4th member of the Leikoupo Formation in the western Sichuan Basin, it is considered that the area near the pinch-out line of the 4th member of the Leikoupo Formation in the eastern depression is a favorable area for exploration of tectonic-stratigraphical gas reservoirs, and the middle and lower part of the eastern slope zone (Guanghan slope zone) in western Sichuan Depression is a favorable area to explore lithologic gas reservoirs.

Key words: The 4th member of the Leikoupo Formation, Accumulation characteristics, Western Sichuan Basin, Exploration prospects

中图分类号: 

  • TE122.1

图1

川西地区雷四段勘探现状(a)与地层综合柱状图(b)"

图2

川西地区雷口坡组沉积期晚期沉积模式"

表1

川西地区钻井及野外剖面雷口坡组烃源岩显微组分分析数据统计"

取样位置岩性

腐泥组

/%

壳质组

/%

镜质组

/%

惰性组

/%

次生组分

/%

类型指数

/%

数量

/件

有机质

类型

H1井碳酸盐岩75~91.310~2.968.53~2500~10049.5~86.43121—Ⅰ
X1井碳酸盐岩85.7107.147.14073.2111
X2井碳酸盐岩0~5000~5000~10013.7~55122—Ⅱ1
C1井碳酸盐岩00000~10050191
L1井碳酸盐岩15.6~44.500~15.7059.5~10036.87~72.75122—Ⅱ1
T1井碳酸盐岩0~4540~1000~260045~5331
大邑大飞水碳酸盐岩92.863.573.570091.961
什邡金河碳酸盐岩0~200~600~2000~10035~5052—Ⅱ1
江油黄莲桥碳酸盐岩84.62~98.880~7.691.12~7.6900~10084.62~98.032

图3

川西地区雷四段储层岩石类型及镜下特征(a) P1井,6 375.00 m, 微晶砂屑灰质白云岩,晶间溶孔发育,铸体薄片,单偏光;(b) P1井,6 045.62 m,粉晶白云岩,晶间溶孔发育,普通薄片,正交偏光;(c) Y1井,5 785.09 m,微晶藻砂屑白云岩,藻间溶孔发育,铸体薄片,单偏光;(d) Y1井,5 791.92 m,藻纹层白云岩,藻间溶孔发育,铸体薄片,单偏光;(f)Y1井,5 703.24 m,藻白云岩,晶间溶孔发育,铸体薄片,单偏光;(f)SY1井,6 190.46 m,含灰质粉—细晶白云岩,晶间溶孔发育,铸体薄片,单偏光"

图4

彭州雷四段构造气藏成藏模式(剖面位置见图1)"

图5

新场隆起带雷四段构造—地层气藏成藏模式(剖面位置见图1)"

图6

广汉斜坡带雷四段岩性气藏成藏模式图(剖面位置见图1)"

图7

川西地区雷四段致密层岩石类型及镜下特征(a)藻凝块灰岩,孔隙度1.24%,P1井,5 822.27 m,普通薄片,单偏光;(b)核形石藻球粒灰岩,孔隙度0.67%,P3井,5 938.15 m,普通薄片,单偏光;(c)微粉晶白云岩,孔隙度1.01%,M2井,6 233.70 m,铸体薄片,单偏光"

表2

M2井岩石物性实验结果统计"

样品

编号

井深/m岩性酒精孔隙度/%突破压力/MPa
16 222.81藻黏结灰岩0.606.50
26 225.42藻球粒藻黏结白云质灰岩1.739.40
36 233.70微粉晶白云岩1.0138.50
46 234.57微粉晶白云岩1.5417.50
56 225.94菌藻粒屑黏结白云岩1.1835.50

图8

川西坳陷雷四段成藏演化示意(剖面位置见图1)"

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