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川西坳陷须三段致密砂岩气藏源储特征及成藏模式

蔡宁波 何磊 王晓龙 彭晓波 卓俊驰 张玲 刘子平 李宜真

蔡宁波, 何磊, 王晓龙, 彭晓波, 卓俊驰, 张玲, 刘子平, 李宜真. 川西坳陷须三段致密砂岩气藏源储特征及成藏模式[J]. 地质科技通报, 2021, 40(6): 1-14. doi: 10.19509/j.cnki.dzkq.2021.0528
引用本文: 蔡宁波, 何磊, 王晓龙, 彭晓波, 卓俊驰, 张玲, 刘子平, 李宜真. 川西坳陷须三段致密砂岩气藏源储特征及成藏模式[J]. 地质科技通报, 2021, 40(6): 1-14. doi: 10.19509/j.cnki.dzkq.2021.0528
Cai Ningbo, He Lei, Wang Xiaolong, Peng Xiaobo, Zhuo Junchi, Zhang Ling, Liu Ziping, Li Yizhen. Characteristics of reservoir-source rock and hydrocarbon accumulation model of tight sandstone gas reservoirs in the third Member of Xujiahe Formation in western Sichuan Depression[J]. Bulletin of Geological Science and Technology, 2021, 40(6): 1-14. doi: 10.19509/j.cnki.dzkq.2021.0528
Citation: Cai Ningbo, He Lei, Wang Xiaolong, Peng Xiaobo, Zhuo Junchi, Zhang Ling, Liu Ziping, Li Yizhen. Characteristics of reservoir-source rock and hydrocarbon accumulation model of tight sandstone gas reservoirs in the third Member of Xujiahe Formation in western Sichuan Depression[J]. Bulletin of Geological Science and Technology, 2021, 40(6): 1-14. doi: 10.19509/j.cnki.dzkq.2021.0528

川西坳陷须三段致密砂岩气藏源储特征及成藏模式

doi: 10.19509/j.cnki.dzkq.2021.0528
基金项目: 

国家自然科学基金项目 41702135

湖南省自然资源厅自然资源科研项目 2020-22

详细信息
    作者简介:

    蔡宁波(1985-), 男, 高级工程师, 主要从事石油地质方面的研究工作。E-mail: 626251285@qq.com

    通讯作者:

    王晓龙(1985-), 男, 副教授, 主要从事地质与地球物理综合研究以及(非常规)油气地质方面的教学和研究工作。E-mail: wxlong@yangtzeu.edu.cn

    彭晓波(1976-), 男, 副教授, 主要从事油气地质与地球物理相关的教学与研究工作。E-mail: pxbcn@126.com

  • 中图分类号: P618.13

Characteristics of reservoir-source rock and hydrocarbon accumulation model of tight sandstone gas reservoirs in the third Member of Xujiahe Formation in western Sichuan Depression

  • 摘要: 川西坳陷须家河组致密气藏已成为拓展油气勘探、发现新储量的重要领域,致密气藏发育特征及其成藏机理成为目前亟需解决的关键科学问题之一。运用地球化学、地球物理和沉积学等分析方法,对须三段源储特征及成藏模式进行了系统分析,对高效烃源岩和优质储层进行了判别和预测,厘定了致密气藏成藏期次和成藏模式。得出以下结论:①须三段发育成熟-高成熟湖相烃源岩,以Ⅲ型干酪根为主,局部偶见Ⅱ2型干酪根。发育于须三下亚段最大湖泛面附近,泥页岩体积分数在65%以上或者单层厚度较大、且1.50% ≤ w(TOC)≤ 10%时,属于高效烃源岩。②基于砂岩粒度中值识别出4期(S1,S2,S3和S4)优质储层,都属于低孔低渗-特低孔特低渗致密储层,中砂-细砂,粒度分布范围为0.5~0.062 5 mm,厚度一般5~10 m。主要发育于三角洲前缘和前三角洲。③烃源岩生排烃时间持续较长,中侏罗世开始生烃,一直持续至晚白垩世;从晚侏罗世开始排烃,早白垩世达到高峰。优质储层经历早期天然气持续充注和晚期凝析气充注,天然气充注时间要早于凝析气充注时间。形成了"断层垂向输导,先聚集后致密,晚期改造调整"的致密气藏成藏模式。

     

  • 图 1  川西坳陷构造单元划分图(a)[30]和综合柱状图(b)

    Figure 1.  Structural unit division (a) and comprehensive histogram (b) of western Sichuan Depression

    图 2  须三段上、中、下亚段烃源岩样品生烃潜量(a~c)与w(TOC)关系图和烃源岩频率(d~f)与w(TOC)关系图

    Figure 2.  Relationship between hydrocarbon generation potential and TOC of source rock samples(a-c), relationship between percentage of TOC and TOC of source rock samples (d-f) in the upper, middle and lower sub-segment of the third member of Xujiahe Formation

    图 3  须三段上(a)、中(b)、下(c)亚段样品类型指数对比图和深度关系图与镜质体反射率(Ro)(d)

    Figure 3.  Comparison of sample type index of the upper (a), middle (b), lower (c) sub-segment and relationship between vitrinite depth and reflectance (Ro) (d) in the third Member of Xujiahe Formation

    图 4  潼深1井-川孝93井-德阳1井-洛深1井层序-烃源岩地球化学特征连井对比剖面

    Figure 4.  Comparison section geochemical characteristics of hydrocarbon source rock with Well Tongshen 1-Well Chuanxiao 93-Well Deyang 1-Well Luoshen 1 sequence

    图 5  须三段粒度中值φ与ΔGR值关系模型(a)、孔隙度与渗透率关系对比图(b)以及储层孔隙演化曲线图(c)

    Figure 5.  Relationship between median particle size φ value and ΔGR value (a), comparison of porosity and permeability (b) reservoir pore evolution curve (c) in the third Member of Xujiahe Formation

    图 6  科1井-新深1井-川罗562井-川合100井连进对比与优质储层识别剖面(剖面位置见图 1)和过井对应地震剖面

    (岩性图例同图 4)

    Figure 6.  Continuous progression comparison and high-quality reservoir identification section of Well Chuankel-Well Xinshen 1-Well Chuanluo 562-Well Chuanhe 100 (section position is shown in Fig. 1) and seismic section of crossing Wells

    图 7  潼深1-川罗562-德阳1-马深1井(a)和科1-新深1-川罗562-川合100井(b)连进对应地震剖面

    (剖面位置见图 1)

    Figure 7.  Continuous corresponding seismic section of well Tongshen 1-Well Chuanluo 562-Well Deyang 1-Well Mashen 1(a) and Well Chuanke1-Well Xinshen 1-Well Chuanluo 562-Well Chuanhe 100 (b)

    (section position is shown in Fig. 1)

    图 8  优质储层S1(a)、优质储层S2(b)、平面预测分布优质储层S3(c)、优质储层S4(d)平面预测分布图

    Figure 8.  Plane prediction distribution map of high-quality reservoir S1 (a), high-quality reservoir S2 (b), high-quality reservoir S3 (c), high-quality reservoir S4 (d)

    图 9  须三段典型样品岩石薄片、阴极发光、铸体薄片和扫面电镜等分析

    a.新856井,3 991.8 m,灰白色含灰细砂质中粒岩屑砂岩,薄片鉴定,单偏光,放大倍数5.0×10;b.新856井, 3 991.8 m, 灰白色含灰细砂质中粒岩屑砂岩,薄片鉴定,正交偏光,放大倍数5.0×10;c.绵阳1井,3 998.22 m,灰色泥晶粒屑有孔虫灰岩,薄片鉴定,正交偏光,放大倍数10×10;d.大邑6井,5 560.5 m,中砂岩,铸体薄片;e.川鸭95井,3 671.3 m,含盆屑细砂质极细砂岩,阴极发光鉴定,-1CL,×5;f.川鸭95井,3 671.3 m,含盆屑细砂质极细砂岩,阴极发光鉴定,-1P,×5;g.川孝568井,3 999.5 m,砂岩,扫描电子显微镜(氩离子),×10 000;h.川鸭95井,3 671.3 m,砂岩,扫描电子显微镜(氩离子),×12 000;i.新11井,4 000.12 m,细砂岩,扫描电子显微镜,×2 000;j.川鸭95井,3 671.3 m,中砂岩,扫描电子显微镜,×3 000

    Figure 9.  Analysis of identification of rock flakes, cathodic luminescence, casting flakes and scanning electron typical samples from the third Member of Xujiahe Formation

    图 10  须三段典型样品包裹体识别与均一温度分布图(a)和川西坳陷联150井热演化、温度与埋藏史模拟图(b)

    Q.第四系;K.白垩系;J3p.蓬莱镇组;J3s.遂宁组;J2x.沙溪庙组下段;T3x5.须五段;T3x4.须四段;T3x3.须三段;T3x2.须二段

    Figure 10.  Identification and uniform temperature distribution of typical sample inclusions in the third Member of Xujiahe Formation (a) and simulation diagram of thermal evolution, temperature and burial history of Well Lian 150 in western Sichuan Depression(b)

    图 11  须三段致密气藏成藏模式图

    (岩性图例同图 4)

    Figure 11.  Accumulation model of tight gas reservoirs in the third Member of Xujiahe Formation

    表  1  川西坳陷各构造单元有机质丰度统计

    Table  1.   Statistics of organic matter abundance of each structural unit in western Sichuan Depression

    评价指标 孝泉丰谷构造带 知新场龙宝梁构造带 成都凹陷 安县鸭子河大邑构造带 梓潼凹陷
    w(TOC)/% $\frac{0.39 \sim 7.3406}{1.90(220)}$ $\frac{0.76 \sim 9.19}{3.07(30)}$ $\frac{0.712 \sim 8.13}{2.25(100)}$ $\frac{0.53 \sim 8.2067}{2.70(126)}$ $\frac{0.939 \sim 9.9}{3.19(70)}$
    (S1+S2)/(mg·g-1) $\frac{0.01 \sim 28.62}{0.92(164)}$ $\frac{0.51 \sim 11.43}{5.97(2)}$ $\frac{0.1 \sim 21.48}{1.693(52)}$ $\frac{0.06 \sim 4.0318}{1.00(115)}$ $\frac{0.35 \sim 12.76}{3.105(6)}$
    氯仿沥青“A”/% $\frac{0.009 \sim 0.164}{0.052(80)}$ $\frac{0.0158 \sim 0.057}{0.0443(5)}$ $\frac{0.0044 \sim 0.1256}{0.0434(36)}$ $\frac{0.0035 \sim 0.615}{0.061(98)}$
    注:$\frac{{最小值 - 最大值}}{{平均值(样品数)}}$
    下载: 导出CSV
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