[1]李蓉,胡昊,许国明b,等.四川盆地西部坳陷雷四上亚段白云岩化作用对储集层的影响[J].新疆石油地质,2017,(02):149.[doi:10.7657/XJPG20170205]
 LI Ronga,b,HU Haoa,et al.Influences of Dolomitization on Reservoirs of Upper T2l4 of Leikoupo Formation in Western Depression, Sichuan Basin[J].Xinjiang Petroleum Geology,2017,(02):149.[doi:10.7657/XJPG20170205]
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四川盆地西部坳陷雷四上亚段白云岩化作用对储集层的影响()
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《新疆石油地质》[ISSN:1001-3873/CN:65-1107/TE]

卷:
期数:
2017年02期
页码:
149
栏目:
出版日期:
2017-04-01

文章信息/Info

Title:
Influences of Dolomitization on Reservoirs of Upper T2l4 of Leikoupo Formation in Western Depression, Sichuan Basin
文章编号:
1001-3873(2017)02-0149-06
作者:
李蓉胡昊许国明b王琼仙b 宋晓波b隆轲b
(中国石化 西南油气分公司 a.博士后科研工作站;b.勘探开发研究院,成都 610041)
Author(s):
LI Rongab HU Haoab XU Guomingb WANG Qiongxianb SONG Xiaobob LONG Keb
(Sinopec Southwest Oil and Gas Field Company, a.Postdoctoral Research Station; b.Research Institute of Exploration and Development, Chengdu, Sichuan 610041, China)
关键词:
四川盆地西部坳陷中三叠统雷口坡组准同生阶段浅埋藏阶段白云岩化作用
Keywords:
Sichuan basin western Sichuan depression Middle Triassic Leikoupo formation parasyngenetic stage shallow-burial stage dolomitization
分类号:
TE112.21
DOI:
10.7657/XJPG20170205
文献标志码:
A
摘要:
四川盆地西部坳陷中三叠统雷口坡组雷四上亚段白云岩厚度大、分布范围广,多口钻井在该套白云岩钻揭高产工业气流。在大量岩心、薄片分析基础上,结合实验测试资料,针对准同生阶段和浅埋藏阶段白云岩化作用进行了研究,并探讨了其对储集层发育的影响。结果表明:雷四上亚段沉积时期,研究区为局限台地沉积环境,沉积水体浅且海平面变化相对频繁,白云岩化流体主要为同时期海水,形成了横向展布稳定的巨厚白云岩;该套白云岩在浅埋藏阶段及以前就已经形成,发育泥晶白云岩、微—粉晶半自形—自形白云岩和少量粉—细晶半自形白云岩,地球化学数据也显示白云岩形成时间较早;浅埋藏阶段形成大量晶间孔,控制了后期侵蚀性流体以弥散状渗流,导致研究区白云岩储集层以层状孔隙型或针状溶孔型为主。
Abstract:
The dolomite of upper T2l4 of the Middle Triassic Leikoupo formation is thick and widely distributed in western Sichuan depression. High-yield industrial natural gas flows have been gained from the wells penetrated in the dolomite. Based on the analysis of cores and thin sections and combining with experimental test data, the paper studies the dolomitization in parasyngenetic and shallow-burial stages and discusses its impact on the reservoir development. The result shows that during the deposition period of upper T2l4 of Leikoupo formation, the study area was a restricted platform environment, the sedimentary water was shallow and the sea level changed frequently, dolomitized fluids were mainly seawater of the same period and thus very thick dolomite formed and were laterally distributed steadily; the dolomite stratum formed during the shallow-burial stage and before, dolomicrite, microcrystalline-powder crystalline subhedral-euhedral dolomite and a few powder-fine crystalline subhedral dolomite were found in the stratum. The geochemistry characteristics show that the dolomite formed in the early time; large amount of intercrystalline pores formed during the shallow-burial stage controlled dispersed flow of the corrosive fluids at the late stage, which resulted in the dolomite reservoirs dominated by laminated pore type or needle-like dissolved pore type in the study area

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更新日期/Last Update: 2017-03-30