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川东北元坝地区上二叠统长兴组优质储层形成机制

李昌峰 侯明才 张小青 李国蓉

李昌峰, 侯明才, 张小青, 等, 2015. 川东北元坝地区上二叠统长兴组优质储层形成机制. 地质力学学报, 21 (2): 278-289.
引用本文: 李昌峰, 侯明才, 张小青, 等, 2015. 川东北元坝地区上二叠统长兴组优质储层形成机制. 地质力学学报, 21 (2): 278-289.
LI Chang-feng, HOU Ming-cai, ZHANG Xiao-qing, et al., 2015. FORMATION MECHANISM OF HIGH-QUALITY RESERVOIRS IN THE UPPER PERMIAN CHANGXING FORMATION IN YUANBA GAS FIELD, NORTHEASTERN SICHUAN BASIN. Journal of Geomechanics, 21 (2): 278-289.
Citation: LI Chang-feng, HOU Ming-cai, ZHANG Xiao-qing, et al., 2015. FORMATION MECHANISM OF HIGH-QUALITY RESERVOIRS IN THE UPPER PERMIAN CHANGXING FORMATION IN YUANBA GAS FIELD, NORTHEASTERN SICHUAN BASIN. Journal of Geomechanics, 21 (2): 278-289.

川东北元坝地区上二叠统长兴组优质储层形成机制

基金项目: 中石化内部项目
详细信息
    作者简介:

    李昌峰(1976-)男, 汉族, 黑龙江林甸县人, 工程师, 硕士研究生, 主要从事开发地质研究工作。E-mail:lichf096@sina.com

  • 中图分类号: TE122.2

FORMATION MECHANISM OF HIGH-QUALITY RESERVOIRS IN THE UPPER PERMIAN CHANGXING FORMATION IN YUANBA GAS FIELD, NORTHEASTERN SICHUAN BASIN

  • 摘要: 川东北元坝气田为千亿储量的海相气田, 上二叠统长兴组礁滩相气藏具有埋藏深、高温、高压、高含硫化氢、气-水关系及工程地质条件复杂等特征。优质储层主要为礁滩相的白云岩, 具有物性好、非均质性强、含气性好的特点。研究表明, 台地边缘生物礁及台地边缘浅滩相控制了有利的储层岩石组合类型与分布, 是优质储层发育的基础; 白云石化作用和溶蚀作用改善和提高了储层岩石的孔隙度, 构造活动形成的多期裂缝提高了储层的渗流性能, 沉积-成岩-构造破裂等多因素的综合作用和合理配置是川东北元坝地区长兴组优质白云岩储层形成关键。

     

  • 图  1  YB-XA井长兴组下段浅缓坡生屑滩及滩间沉积剖面图

    Figure  1.  Sedimentological section showing carbonate rampbioclastshoal and inter-shoal facies in the Lower Member of the Changxing Formation in the Well YB-XA

    图  2  长兴组埋藏白云石化作用模式

    Figure  2.  Schematic diagram showing the burial dolomitization in the Changxing Formation

    图  3  压实压溶作用特征

    Figure  3.  Microphotograph and core photo showing mechanical compaction and pressure dissolution

    图  4  长兴组储层充填胶结作用

    Figure  4.  Microphotograph showing diagenetic cementation in the Changxing Formation

    图  5  大气水溶蚀作用特征

    Figure  5.  Microphotograph showing meteoric dissolution

    图  6  长兴组储层两期溶蚀作用特征(左为中期,右为晚期;10倍,单偏光)

    Figure  6.  Microphotograph showing two-stage dissolution occurred in the Changxing Formation

    图  7  元坝地区长兴组岩心的多期构造裂缝

    Figure  7.  Core photo showing multi-history tectonic-related fracture

    图  8  元坝地区长兴组不同相带储层物征对比

    Figure  8.  Histogram showing depositional facies and the variation of porosity

    图  9  长兴组生物礁沉积模式

    Figure  9.  Schematic diagram showing carbonate reef deposition occurred in the Changxing Formation

    表  1  长兴组白云岩类储层物性特征

    Table  1.   Dolomite reservoir properties in the Changxing Formation

    岩性孔隙度/%平均孔隙度/%渗透率/10-3 μm2几何平均渗透率/10-3μm2
    晶粒白云岩1.22~24.658.810.0028~2571.90262.2698
    残余生屑白云岩2.01~21.448.050.0098~2385.48261.8343
    残余生屑白云岩2.26~6.273.790.0353~2.86630.4314
    灰质白云岩0.82~11.053.820.0045~60.01670.2400
    下载: 导出CSV

    表  2  元坝地区长兴组白云石碳氧稳定同位素部分样品分析结果统计

    Table  2.   Carbon and oxygen isotopic analysis of dolomites in the Changxing Formation in Yuanba area

    序号井号岩心块号产状描述δ13C/‰δ18O/‰ZT/℃
    1YB-X27 49/51颗粒白云岩,以微晶白云石为主1.56-3.87128.5732.04
    2YB-X26 2/18主要为微晶白云石2.27-3.32130.3029.38
    3YB-X98 3/22以粉-微晶白云石为主4.28-4.88133.6436.99
    4YB-X13 12/30主要为藻云岩微晶白云石2.84-5.03130.6137.73
    5YB-X38 7/47粉—细晶它形脏白云石3.80-5.71132.2441.11
    6YB-X75 4/25粉—细晶它形脏白云石3.23-5.73131.0641.21
    7YB-X212 32/92主要为粉—细晶它形脏白云石2.03-5.15128.8938.32
    8YB-X97 3/27粉—细晶它形脏白云石4.02-5.27132.9138.92
    9YB-X114 13/87以粉—细晶它形白云石为主4.55-5.09134.0838.03
    10YB-X122 1/73粉—细晶它形脏白云石为主5.56-5.35136.0239.32
    11YB-X227 31/56主要为细晶它形脏白云石5.03-4.85135.1936.84
    12YB-X2324 42/42细晶它形脏白云石4.66-5.41134.1539.61
    13YB-X46 3/51粉—细晶它形脏白云石为主4.82-5.17134.6038.42
    14YB-X28 6/47细晶自形白云石,脏3.82-5.51132.3840.11
    15YB-X277 25/29细—中晶自形白云石,具雾心亮边3.66-5.18132.2238.47
    16YB-X2323 22/43中—细晶自形白云石为主4.76-5.73134.1941.21
    17YB-X292 17/18溶蚀孔洞中—细晶自形白云石3.97-5.80132.5441.56
    18YB-X45 30/36细晶自形白云石占优势4.77-5.50134.3340.06
    19YB-X13 12/30溶孔细晶自形白云石较多2.88-5.23130.5938.72
    20YB-X027 2/21细—中晶自形白云石3.01-5.34130.8139.27
    注:数据来源于成都理工大学李国蓉
    下载: 导出CSV

    表  3  生物礁不同位置钻遇储层参数统计

    Table  3.   Parameters of the reservoirs in different locations of carbonate reef

    礁体位置储层厚度/mⅠ类储层厚度/mⅡ类储层厚度/mⅢ类储层厚度/m平均孔隙/%
    礁盖39.92.518.219.25.2
    礁核14.802.012.83.2
    礁基0.600.10.50.5
    下载: 导出CSV
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  • 收稿日期:  2014-09-10
  • 刊出日期:  2015-06-28

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