玛北地区二叠系风城组一段优质储层特征、成因及分布

doi:10.3969/j.issn.1672-7703.2022.03.009

摘要/Abstract

摘要： 玛北地区二叠系风城组一段发育火山岩、碎屑岩和云质岩3种不同成因类型的储层，优质储层主要为高孔火山岩和碎屑岩，但是其储层特征及横向、纵向分布规律不清楚。应用岩心、录井、测井和地震等资料，对风城组一段优质储层进行综合研究，风城组一段自下而上发育粉—细砂岩+含砾砂岩、流纹质熔结凝灰岩和含砾砂岩+中—细砂岩+砾岩3套优质储层，储集空间以气孔和剩余粒间孔为主，含油性好，流纹质熔结凝灰岩气孔为火山碎屑灰流重熔封隔形成，两套碎屑岩为扇三角洲前缘沉积物与火山岩剥蚀物混积而成。在成因分析基础上，建立了玛北地区风城组一段优质储层成因模式，同时为单独识别3套优质储层，对地震资料进行了重新处理解释，应用高分辨率反演手段有效预测了3套储层展布情况，其中风城组一段上部碎屑岩有利面积为70km²，主要分布于风南1井区和玛页1井区周边，中部火山岩有利面积为170km²，下部碎屑岩有利面积为127km²，均主要分布于风南14井—夏40井的广大区域。

关键词: 玛湖凹陷, 风城组, 流纹质熔结凝灰岩, 碎屑岩, 储层成因, 有利区预测

Abstract: Three types of reservoirs are developed in the first member of the Permian Fengcheng Formation (Feng 1 member) in Mabei area with different genesis, i.e., volcanic rock, clastic rock and dolomitic rock. The high-quality reservoirs are mainly high porosity volcanic rock and clastic rock, but the reservoir characteristics and the lateral and vertical distribution are unclear. The comprehensive study on high-quality reservoir of Feng 1 member is conducted by using core, mud logging, well logging and seismic data. The results show that three sets of high-quality reservoirs are developed from bottom to top in Feng 1 member in Mabei area, namely the silty-fine sandstone + gravely sandstone, rhyolitic fused tuff, and gravely sandstone + medium-fine sandstone + conglomerate, and the main reservoir space is composed of vesicles and residual intergranular pores, with good oil-bearing property. The vesicle of the rhyolitic fused tuff is formed by the remelting and sealing of pyroclastic flow. Two sets of clastic rocks are mixed by fan delta front sediments and volcanic rock denudations. Base on genesis analysis, a genetic model of high-quality reservoir of Feng 1 member in Mabei area is established. Furthermore, seismic data are reprocessed and interpreted to identify the three individual sets of high-quality reservoirs, and high-resolution inversion method is applied to effectively predict the distribution of the three sets of reservoirs. The favorable area of clastic rock in the upper section of Feng 1 member is 70 km², mainly distributed in Fengnan 1 and Maye 1 well areas, that of volcanic rock in the middle section is 170 km², and of clastic rock in the lower section is 127 km², mainly in a large area from Well Fengnan 14 to Well Xia 40.

中图分类号:

TE111.3

王江涛, 杨森, 邹阳, 赵毅, 黄立良, 牟立伟, 何文军, 赵辛楣, 蔡金元. 玛北地区二叠系风城组一段优质储层特征、成因及分布[J]. 中国石油勘探, 2022, 27(3): 99-109.

Wang Jiangtao, Yang Sen, Zou Yang, Zhao Yi, Huang Liliang, Mu Liwei, He Wenjun, Zhao Xinmei, Cai Jinyuan. Characteristics, genesis and distribution of high-quality reservoir of the first member of the Permian Fengcheng Formation in Mabei area, Junggar Basin[J]. China Petroleum Exploration, 2022, 27(3): 99-109.

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