石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (6): 1188-1196.doi: 10.11743/ogg20200607
祖克威1,2(), 范凌霄1, 王波3, 曹东升2, 管聪2, 李中超1, 程秀申1
收稿日期:
2019-04-16
出版日期:
2020-12-28
发布日期:
2020-12-09
作者简介:
祖克威(1986-),男,博士,职称构造应力场分析与储层裂缝评价。E-mail:基金资助:
Kewei Zu1,2(), Lingxiao Fan1, Bo Wang3, Dongsheng Cao2, Cong Guan2, Zhongchao Li1, Xiushen Cheng1
Received:
2019-04-16
Online:
2020-12-28
Published:
2020-12-09
摘要:
利用野外露头、岩心、薄片和测井资料,对四川盆地普光地区嘉陵江组二段(简称嘉二段)碳酸盐岩储层裂缝的参数特征、发育规律和控制因素开展综合分析。研究表明,普光地区嘉二段裂缝发育有北东-南西向、东西向、南北向和北西-南东向4组裂缝。其中北东-南西向为优势方位,裂缝以高角度裂缝为主,开度通常小于300 μm。裂缝孔隙度和渗透率计算结果表明,嘉二段裂缝的储集作用相对较弱,在储层中主要起到渗流通道的作用。垂向上,裂缝主要发育在嘉二段3个亚段膏岩下伏的白云岩段,嘉二中亚段裂缝最为发育。嘉二段储层裂缝的发育受构造、岩石力学层厚、岩性和成岩作用等因素控制。研究区现今水平最大主应力方位为近东西向,在开发过程中,东西向裂缝更容易优先开启,成为主要的渗流通道,同时北东-南西向裂缝作为优势发育方位易形成定向的高渗带。
中图分类号:
表1
四川盆地普光地区嘉二段裂缝发育带宽度与断层参数关系"
裂缝发育带宽度/m | 倾角/ (°) | 斜向断距/m | 曲率/ (km-1) | 断层延伸长度/m | 断层走向 |
752.00 | 50 | 511.719 7 | 5.628 112 | 14 782 | 北西-南东 |
915.66 | 50 | 219.308 4 | 5.628 112 | 11 481 | 北西-南东 |
1 036.00 | 36 | 353.870 7 | 2.618 654 | 9 541 | 北西-南东 |
729.00 | 52 | 147.206 1 | 2.618 654 | 9 673 | 北西-南东 |
503.00 | 68 | 554.256 3 | 1.409 710 | 14 782 | 北东-南西 |
346.00 | 74 | 75.705 28 | 1.409 710 | 11 481 | 北东-南西 |
407.88 | 66 | 207.298 4 | 2.403 311 | 9 541 | 北东-南西 |
271.00 | 76 | 131.263 4 | 2.403 311 | 9 673 | 北东-南西 |
表2
四川盆地普光地区嘉二段不同方向裂缝开启压力的大小"
井名 | 深度/m | 东西向裂缝开启压力/MPa | 北东向裂缝开启压力/MPa | 北西向裂缝开启压力/MPa | 南北向裂缝开启压力/MPa |
PG1 | 4 845~4 908 | 35.75 | 45.25 | 80.75 | 83.25 |
PG2 | 4 337~4 395 | 34.59 | 44.41 | 80.59 | 83.41 |
PG4 | 5 025~5 085 | 36.59 | 44.41 | 81.58 | 82.81 |
PG5 | 4 255~4 307 | 34.93 | 44.06 | 80.86 | 83.06 |
DW1 | 4 508~4 553 | 35.72 | 45.1 | 80.55 | 83.1 |
DW2 | 4 209~4 275 | 35.01 | 43.99 | 81.01 | 82.99 |
LB1 | 2 393~2 462 | 32.68 | 42.22 | 78.88 | 81.11 |
LJ1 | 5 412~5 488 | 37.29 | 46.27 | 80.73 | 83.27 |
DY1 | 3 948~4 005 | 34.64 | 44.31 | 80.93 | 83.07 |
F1 | 4 509~4 563 | 35.57 | 43.42 | 81.58 | 82.42 |
F2 | 5 945~6 012 | 38.62 | 48.88 | 80.84 | 86.16 |
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