摘要
准噶尔盆地石炭系火山岩储层分布广泛,明确火山岩储层特征及成藏规律,对于高效开发这类特殊油气藏具有积极意义。本文以石西油田石炭系火山岩为例,综合运用岩心、薄片、地震、测井、分析化验等资料,对该区火山岩储层特征及成藏规律进行分析。研究表明:石炭系火山岩岩性以条带状熔岩和集块岩为主,岩相主要为溢流相;次生孔隙和构造裂缝是重要的储集空间,构造裂缝的发育受岩性岩相、构造位置及古地貌的控制,形成的溶蚀—裂缝孔隙对于提高储集性能具有重要意义;孔隙结构类型可以分类4类,以Ⅰ类孔隙结构最优,集块岩和角砾熔岩表现为较高孔—较高渗,条带状熔岩为较高孔—较低渗特征;石炭系火山岩储层油气成藏条件优越,表现为“两个优势运移通道、两次成藏”的特征,油藏厚度、构造形态及岩性岩相条件是火山岩油气富集高产的重要因素。
The Carboniferous volcanic reservoirs are widely distributed in Junggar Basin. To clarify the reservoir characteristics and accumulation rules of volcanic reservoirs is of positive significance for the efficient development of volcanic oil and gas reservoirs. Taking the Carboniferous volcanic rocks in Shixi Oilfield as an example, this paper analyzes the reservoir characteristics and accumulation factors of volcanic rocks in this area by the data of core, thin section, seismic, logging and experimental tests. The lithology of Carboniferous volcanic rocks is mainly banded lava and agglomerate, and the lithofacies is mainly overflow facies. Secondary pores and tectonic fractures are the important reservoir spaces. The development of tectonic fractures is controlled by lithology, lithofacies, tectonic location and paleogeomorphology, and the dissolution-fracture pores are of great significance to reservoir performance. The pore structure types can be classified into four types, the type I pore structure is the best.Agglomerate and breccia lavas are characterized by high porosity and high permeability, and banded lavas are high porosity and low permeability. The hydrocarbon accumulation conditions of carboniferous reservoir are superior, showing the characteristics of "two migration channels and two accumulation formation". Reservoir thickness, structural morphology and lithologic facies conditions are important factors for the enrichment and high yield of volcanic oil and gas.
作者
李想
付磊
纪宝强
谢磊
张金龙
李虎
秦启荣
Li Xiang;Fu Lei;Ji Baoqiang;Xie Lei;Zhang Jinlong;Li Hu;Qin Qirong(The Shixi Oilfield Operation District,Xinjiang Oilfield Company of PetroChina,Karamay,Xinjiang 834000;Southwest Petroleum University,Chengdu 610500)
出处
《地质科学》
CAS
CSCD
北大核心
2022年第3期704-719,共16页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
储层特征
构造裂缝
成藏条件
石炭系火山岩
石西油田
Reservoir characteristics
Tectonic fracture
Reservoir accumulation conditions
Carboniferous volcanic rocks
Shixi Oilfield
