钻采工艺 ›› 2020, Vol. 43 ›› Issue (5): 42-45.DOI: 10.3969/J. ISSN.1006-768X.2020.05.12

• 开采工艺 • 上一篇    下一篇

川中龙王庙组储层沥青特性及其对酸蚀裂缝导流能力的影响

游佳春1,刘威2潘冠昌1张项飞2朱 熙2王福平3王刚2   

  1. 1成都理工大学能源学院  2中石油西南油气田分公司川中油气矿 3哈尔滨石油学院
  • 出版日期:2020-09-25 发布日期:2020-09-25
  • 作者简介:游佳春( 1995 - ) , 成都理工大学能源学院 2017 级在读硕士研究生, 主要从事储层保护及改造技术研究工作。地址: ( 610059 )四川省成都市成华区二仙桥东三路 1 号成都理工大学能源学院, 电话:18408266151 , E - mail:2753655678@ qq. com。
  • 基金资助:
    中石油西南油气田分公司川中油气矿科研计划项目“ 龙女寺区块磨溪 29 井区龙王庙组含沥青质储层改造工艺技术研究-地质工程储层物性及技术配套” (编号:2018 - DZ - 10)。

Bitumen Characteristics of Longwangmiao Formation in Central Sichuan and Its Effect on the Conductivity of Acid-eroded Fractures

YOU Jiachun1 , LIU Wei2, PAN Guanchang1 , ZHANG Xiangfei2, ZHU Xi2, WANG Fuping3 , WANG Gang2    

  1. 1 .Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. Southwest Oil and Gas Field Company, Suining, Sichuan 629000, China; 3. Harbin Institute of Petroleum, Harbin, Heilongjiang 150028, China
  • Online:2020-09-25 Published:2020-09-25

摘要: 龙女寺龙王庙组碳酸盐岩储层天然气资源量丰富,部分井区受沥青存在影响,在一定程度上抑制了气井酸压改造效果。为揭示沥青特性及其对储层酸压改造效果的影响机制,开展了系列室内实验表征沥青的基本特征,并室内评价了沥青对酸蚀裂缝导流能力的影响。结果表明,龙女寺龙王庙组碳酸盐岩储层沥青来源于下寒武统烃源岩,其质量含量平均值为2.71%;沥青等效镜质体射率平均值为3.00%,处于过成熟阶段,属热演化成因的焦沥青类;储层沥青中碳质沥青含量高达99%以上,主要充填在缝合线、晶间孔、溶孔/洞内;导流能力损害程度与沥青含量呈正比,酸压改造后易形成不溶的游离沥青,堵塞酸蚀裂缝造成严重导流能力损害。

关键词: 龙女寺龙王庙组, 储层沥青, 成熟度, 裂缝导流能力, 碳酸盐岩

Abstract:

Longwangmiao formation in Longnvsi area is rich in natural gas resources, some well areas are affected by bitumen, which to a certain extent inhibits the effect of acid fracturing. A series of laboratory experiments were carried out to characterize the basic characteristics of bitumen and evaluate its effect on the conductivity of acid-eroded fracture. The results show that the carbonate reservoir bitumen of Longwangmiao formation in Longnvsi area comes from the Lower Cambrian source rocks, and the average mass content is 2. 71 % . The equivalent vitrinite reflectance of bitumen is 3. 00% , which is in the over mature stage. The content of pyrobitumen of the bitumen in the reservoir is up to 99% , which is mainly filled in the stylolite, intercrystalline pores and dissolved pores /holes. It is easy to form insoluble free bitumen after acid pressing transformation, and the acid corrosion fracture is blocked, which causes serious damage to the conductivity.

Key words: Longwangmiao formation in Longnvsi area, reservoir bitumen, maturity, fracture conductivity, carbonate rock