天然气地球科学 ›› 2020, Vol. 31 ›› Issue (1): 3746.doi: 10.11764/j.issn.1672-1926.2019.08.006
吕文雅1,2(),曾联波1,2(
),周思宾3,吉园园4,梁丰2,惠晨2,尉加盛5
Wen-ya LÜ1,2(),Lian-bo ZENG1,2(
),Si-bin ZHOU3,Yuan-yuan JI4,Feng LIANG2,Chen HUI2,Jia-sheng WEI5
摘要:
以鄂尔多斯盆地西南部红河油田长8致密砂岩储层为例,根据铸体薄片、扫描电镜分析,结合岩心和测井资料,采用地质学统计的方法,对微观裂缝的发育特征及控制因素进行系统分析,在此基础上,分析典型区块Q1井区的微观裂缝分布特征。结果表明:从地质成因上,该区致密砂岩储层的微观裂缝可以分为构造、成岩、构造—成岩和异常高压成因4种类型,其中以构造成因的微裂缝和构造—成岩成因的微裂缝为主,该区微观裂缝大部分为有效裂缝,少量无效裂缝被方解石、石英及炭质等充填。该区微观裂缝的发育程度受沉积作用、成岩作用、构造作用及异常高压作用控制。云母、岩屑等塑性成分含量越高,杂基含量越多,岩石颗粒越细,微裂缝发育程度越差;压实作用越强,越有利于构造—成岩成因的粒内缝、粒缘缝发育;随着胶结强度增强,粒内缝和粒缘缝发育程度降低,利于发育构造成因的微裂缝。典型区块Q1井区,在细砂岩强压实方解石强胶结相中,微观裂缝发育程度最强;其次为细砂岩强压实相和中—细砂岩方解石中胶结相;在细砂岩高岭石胶结相和绿泥石胶结中溶解相中,微观裂缝发育程度较弱;在泥岩中微观裂缝发育程度最弱。
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