摘要
查干凹陷乌力吉构造带巴音戈壁组碎屑岩岩性主要为长石岩屑、岩屑长石和岩屑砂岩,孔间填隙物以白云质和灰云质为主,局部可见泥质及灰质填隙物。储集空间以粒间溶蚀孔为主,其次为粒内溶蚀孔和胶结物溶蚀孔,构造裂缝较少发育。孔隙结构具孔喉半径小、分选性差的特征,储集层整体具有低孔隙度、低渗透率的特点。储集层物性主要受沉积环境和成岩作用影响,在扇三角洲沉积体系中,河口坝和水下分流河道的储集层物性相对较好,三角洲平原及漫滩沼泽带物性相对较差。分析认为有机质热演化、黏土矿物转化排酸及深部酸性热流体溶蚀等因素,使该区巴音戈壁组在埋深1800~3000 m发育异常高溶蚀带,明显改善了碎屑岩的储集性能。因此,在乌力吉构造带寻找高溶蚀发育带是提高巴音戈壁组油气藏勘探成效的关键。
The lithology of clastic rocks in Bayin Gobi Formation of Wuliji structural belt in Chagan Sag is mainly feldspar debris,detrital feldspar and litharenite.The interstitial material between holes are mainly dolomite and dolomite limestone,shale and lime interstitial materials are partially visible.The reservoir space is dominated by intergranular dissolution pores,followed by intragranular dissolution pores and cement dissolution pores,and structural fractures are less developed.With small hole throat radius and poor sorting of pore structures,the reservoir is of low porosity and low permeability.Reservoir physical properties are mainly affected by sedimentary environment and diagenesis.In fan delta sedimentary system,the physical properties of reservoirs in estuary dams and underwater distributary channels are relatively good,while the physical properties of delta pains and back swamps are relatively poor.Analysis suggests that factors such as thermal evolution of organic matter,conversion and acid discharge of clay minerals and deep acid thermal fluid dissolution have made Bayin Gobi Formation in the area develop an abnormally high dissolution zone at a depth of 1800~3000m,which significantly improved the reservoir performance of clastic rocks.Therefore,searching for high dissolution development zones in Wuliji structural belt is the key to improve the exploration effect of oil and gas reservoirs in Bayin Gobi Formation.
作者
万利
王䶮舒
WAN Li;WANG Yanshu(Mud Logging Company of Sinopec Zhongyuan Petroleum Engineering Company,Puyang,Henan 457001,China)
出处
《录井工程》
2020年第2期130-135,共6页
Mud Logging Engineering
关键词
查干凹陷
乌力吉
巴音戈壁组
储集层特征
控制因素
Chagan Sag
Wuliji
Bayin Gobi Formation
reservoir characteristics
controlling factor
作者简介
万利,高级工程师,1972年生,1994年毕业于西北大学石油地质专业,现任中原石油工程公司录井公司副经理,从事质量与技术管理工作,通信地址:457001河南省濮阳市五一路录井公司地质所,电话:13938328550,E-mail:rorls@163.com。
