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  

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

作　　者：游佳春 刘威[2] 潘冠昌 张项飞 朱熙 王福平[3] 王刚[2] YOU Jiachun;LIU Wei;PAN Guanchang;ZHANG Xiangfei;ZHU Xi;WANG Fuping;WANG Gang(Chengdu University of Technology,Chengdu,Sichuan 610059,China;Southwest Oiland Gas Field Company,Suining,Sichuan 629000,China;Harbin Institute of Petroleum,Harbin,Heilongjiang 150028,China)

机构地区：[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　　处：《钻采工艺》2020年第5期42-45,I0003,共5页Drilling & Production Technology

基　　金：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)。

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。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 overmature 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.

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 

分 类 号：TE377[石油与天然气工程—油气田开发工程]