新疆北部石炭系火山岩风化壳有效储层特征及分布规律

doi:10.7623/syxb201105004

石油学报 ›› 2011, Vol. 32 ›› Issue (5): 757-766.DOI: 10.7623/syxb201105004

新疆北部石炭系火山岩风化壳有效储层特征及分布规律

王京红 1 靳久强 1 朱如凯 1 毛治国 1 王志勇 2 唐志奇 1

1中国石油勘探开发研究院北京 100083； 2中国石油吐哈油田公司新疆哈密 839009

收稿日期:2010-12-12 修回日期:2011-06-03 出版日期:2011-09-25 发布日期:2011-11-28
通讯作者: 王京红
作者简介:王京红，女，1970年8月生，1991年毕业于中国石油大学（华东），现为中国石油勘探开发研究院在读博士研究生，主要从事构造与储层地质方面的研究工作。
基金资助:
国家科技重大专项（2008ZX05001、2011ZX05001）和国家重点基础研究发展规划（973）项目（2009CB219304）联合资助。

Characters and distribution patterns of effective reservoirs in the Carboniferous volcanic weathering crust in northern Xinjiang

WANG Jinghong 1 JIN Jiuqiang 1 ZHU Rukai 1 MAO Zhiguo 1 WANG Zhiyong 2 TANG Zhiqi 1

Received:2010-12-12 Revised:2011-06-03 Online:2011-09-25 Published:2011-11-28

摘要/Abstract

摘要：

利用露头、岩心、测井、地震、分析化验等资料对新疆北部石炭系火山岩风化壳进行了综合研究，建立了利用风化指数识别风化壳结构的模型。火山岩风化壳具有土壤层、水解带、溶蚀带、崩解带和母岩5层结构，其中溶蚀带、崩解带储层物性最好。火山岩风化壳储层孔隙喉道半径分布概率呈现出双峰特征；储集空间类型主要包括溶蚀孔隙型、孔隙裂缝型、裂缝型和洞缝型4类，其中溶蚀孔隙是其主要储集空间，裂缝是其主要的渗流空间。在断裂不发育处火山岩风化壳有效储层厚度可达510 m，在断裂发育处有效储层可深至风化面之下1100 m。火山岩风化壳储层主要分布于古地貌高部位、斜坡带和低部位的断裂发育处，其形成受控于古地貌、断裂和风化淋滤时间。

关键词: 新疆北部, 石炭系, 火山岩, 风化壳结构, 储集空间类型, 有效储层厚度, 分布规律

Abstract:

Volcanic weathering crust has been considered as a kind of significant reservoirs,its genetic conditions, characteristics, types and distribution patterns currently become an advanced research topic of reservoirs. Through comprehensive research of volcanic outcrops, cores, logs, seismic and laboratory analyses of the Carboniferous in northern Xinjiang, a five-layer structural complex of volcanic weathering crust was proposed, namely soil layer, hydrolysis belt, corrosion belt, disintegration belt and parent rock. A weathering index model to identify weathering crust structures was then built. Reservoir properties of the corrosion and disintegration belts were recognized to be the best of the five-layer structures. Pore throat radius probability of the volcanic weathering crust showed a bimodal distribution. Chiefly, 4 types of reservoir space, including corroded pore, pore-fracture, fracture and cavity, were identified, of which corroded pores dominated the reservoir space and fractures controlled the main seepage space. In the whole volcanic weathering crust, the thickness of effective reservoir rocks in fault-undeveloped places could reach to 510 m, while that in fault-developed places stretched downward to 1100 m. The formation of five-layer structures of reservoir rocks was controlled by paleogeomorphology, fault, weathering and leaching time. These rocks were mainly distributed in high parts of paleogeomorphology, slope belts and low-lying parts of fault-developed places. These conclusions have not only enriched the volcanic reservoir theory, but also instructed the exploration and well depth design, which have expanded exploration targets of the Kelameili Oilfield and Niudong Oilfield. Meanwhile, the theory is of great scientific significance and application in focusing oil and gas exploration on volcanic weathered crust.

Key words: northern Xinjiang, Carboniferous, volcanic rock, structure of weathering crust, reservoir space type, effective reservoir thickness, distribution pattern

王京红靳久强朱如凯毛治国王志勇唐志奇. 新疆北部石炭系火山岩风化壳有效储层特征及分布规律[J]. 石油学报, 2011, 32(5): 757-766.

WANG Jinghong JIN Jiuqiang ZHU Rukai MAO Zhiguo WANG Zhiyong TANG Zhiqi. Characters and distribution patterns of effective reservoirs in the Carboniferous volcanic weathering crust in northern Xinjiang[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(5): 757-766.

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新疆北部石炭系火山岩风化壳有效储层特征及分布规律

Characters and distribution patterns of effective reservoirs in the Carboniferous volcanic weathering crust in northern Xinjiang

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