四川盆地川中地区寒武系龙王庙组颗粒滩储层成因及其影响

doi:10.11764/j.issn.1672-1926.2018.11.010

天然气地球科学

四川盆地川中地区寒武系龙王庙组颗粒滩储层成因及其影响

谢武仁，杨威，李熙喆，魏国齐，马石玉，文龙，郭振华

1.中国石油勘探开发研究院，河北廊坊 065007； 2.西南油气田分公司勘探开发研究院，四川成都 610041

收稿日期:2018-11-01 修回日期:2018-11-24 出版日期:2018-12-10
作者简介:谢武仁(1980-)，男，江西临川人，高级工程师，硕士，主要从事沉积储层研究.E-mail：xwr69@petrochina.com.cn.
基金资助:
国家科技重大专项(编号：2016ZX05007)；中国科学院A类战略性先导科技专项(编号：XDA14010403)联合资助.

The origin and influence of the grain beach reservoirs of Cambrian Longwangmiao Formation in Central Sichuan area,Sichuan Basin

Xie Wu-ren，Yang Wei，Li Xi-zhe，Wei Guo-qi，Ma Shi-yu，Wen Long，Guo Zhen-hua

1.PetroChina Research Institute of Petroleum Exploration and Development,Langfang 065007,China;2.Research Institute of Exploration and Development，PetroChina Southwest Oil and Gas Field Company，Chengdu 610041,China

Received:2018-11-01 Revised:2018-11-24 Online:2018-12-10

摘要/Abstract

摘要： 以川中地区12口井龙王庙组岩心的详细观察为基础，结合地震和钻井资料，对该地区龙王庙组沉积古背景、滩相储层特征、颗粒滩旋回与组合进行了探讨，分析了大面积分布的滩相储层与油气高产富集的关系。研究区龙王庙组为缓坡沉积环境，沉积前发育川中高石梯—磨溪同沉积古隆起，控制川中地区发育大面积分布的颗粒滩；受海平面整体海退影响，龙王庙组纵向上发育4期颗粒滩，每一期滩体厚约10~20m，横向延伸5~15km，叠置连片；颗粒滩由滩主体和滩边缘组成，其分布主要受构造微地貌差异控制，滩主体彼此分隔，滩边缘横向上叠置连片；颗粒滩主要为砂屑白云岩，受后期白云石化作用和表生溶蚀作用的控制，形成溶蚀孔洞和多期裂缝发育且大面积分布的优质储层，其中颗粒滩主体储层厚度大，单井测试产量高，为油气高产富集区。

关键词: 四川盆地, 高石梯—磨溪, 颗粒滩, 滩主体, 白云岩储层

Abstract: Based on thorough observation of the core of Longwangmiao Formation of 12 wells in Central Sichuan area and combined with seismic and drilling data,this paper studies the deposition environment,grain shoal reservoir characteristics and the sequence and combination of grain shoal of Longwangmiao Formation in Central Sichuan area,and analyzes the relationship of the widespread grain shoal reservoir and the high production of petroleum in this area.Longwangmiao Formation in the study area was deposited in gentle slope environment,and due to the formation of Gaoshiti-Moxisyn-depositional paleo-uplift in Central Sichuan before its deposition,the paleo-uplift controlled the large-area distribution of grain shoal in Longwangmiao Formation.Owing to overall regression and decline of the sea level,grain shoals formed in four stages vertically stacked within Longwangmiao Formation.Each grain shoal has a thickness of 10-20m and spreads laterally for 5-15km.Different grain shoals vertically superimposed,covering a large area.Grain shoals is composed of shoal body and shoal margin,and their distribution is controlled by minor landform change.The shoal bodies are separated and shoal margins are inter-connected.Grain shoals are mainly sand-grain dolostone,and it is reformed by dolomitization and epigenickarstification in later periods,forming high-quality reservoir with widespread karst pores,holes and cracks formed in multiple stages.Because of their great thickness,reservoirs in shoal margin have high production in single-well testing,and thus is the target of high petroleum production and rich petroleum accumulation.

Key words: Sichuan Basin, Gaoshiti-Moxi, Grain shoal, Shoal body, Dolostone reservoir

中图分类号:

TE121.3

谢武仁, 杨威, 李熙喆, 魏国齐, 马石玉, 文龙, 郭振华. 四川盆地川中地区寒武系龙王庙组颗粒滩储层成因及其影响[J]. 天然气地球科学, 2018, 28(12): 1715–1726.

Xie Wu-ren, Yang Wei, Li Xi-zhe, Wei Guo-qi, Ma Shi-yu, Wen Long, Guo Zhen-hua. The origin and influence of the grain beach reservoirs of Cambrian Longwangmiao Formation in Central Sichuan area,Sichuan Basin[J]. Natural Gas Geoscience, 2018, 28(12): 1715–1726.

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