摘要
浊积扇沉积构成单元主要包含内扇沟道,中扇沟道、朵叶主体,外扇朵叶、席状砂以及扇缘薄层席状砂等,各单元储层物性差异大,直接影响勘探开发部署,值得开展深入系统研究。本文基于琼东南盆地梅山组20个已钻浊积扇的沉积构成单元储层特征分析,建立了浊积扇主要沉积构成单元的岩—电—震特征及识别标志,详细分析了其主要沉积构成单元的砂体规模、几何形态、厚度变化、粒度分布、储层非均质性等要素。结果表明,中扇沟道—朵叶结合部巨厚层块状砂岩、外扇朵叶厚层砂岩和席状砂岩储层内部均匀,物性较好;内扇沟道砂岩内部非均质严重,储层物性受到影响;扇缘薄层席状砂岩由于层薄、粒度细、高含泥及高含钙而致密。钻探证明多口探井因部署在内扇沟道上未获商业产能;新部署在中扇沟道—朵叶结合部巨厚层砂岩与外扇席状砂的探井均获得了商业成功。
Sedimentary composition units of turbidite fan mainly include channel of the inner fan,the channel and main body of the lobe of the mid fan,and the lobe,sheet sand of the outer fan,and thin sheet sand at the fan margin.Due to large differences in reservoir physical properties of each unit,the analysis about sedimentary composition of turbidite fan and reservoir differences of the main units is crucial for deployment of exploration and development.Based on the study of sedimentary composition and reservoir characteristics of main units of 20 drilled turbidite fans of Meishan Formation,the rock-electricity-seismic identification criteria for main units of different types of turbidite fans were summarized,it is possible to accurately analyze the scale and geometric shape of the sand bodies,lateral variation of sedimentary thickness,particle size distribution,reservoir heterogeneity and connectivity of the main units of submarine fans,and so on.The research revealed that for the extremely thick massive sandstone at the junction of channels and lobes in the mid fan,the thick lobe sandstone in the outer fan as well as sheet sandstone,the reservoir possess uniform interior and good physical properties;the interior of the turbidite channel sandstone in the inner fan is severely heterogeneous,affecting the physical properties of the reservoir;thin sheet sandstone at the fan margin is often dense due to its thin layer,fine particle size,high mud content and high calcium content.Many exploration wells in this area have been deployed on turbidite channels in the inner fan,was not achieved.Under the guidance of this research achievement,new exploration wells drilled in thick sandstone in the mid fan and sheet sand in the outer fan have achieved commercial success.
作者
刘子玉
贾万丽
李建平
刘为
武爱俊
Liu Ziyu;Jia Wanli;Li Jianping;Liu Wei;Wu Aijun(CNOOC Research Institute Ltd.,Beijing 100028;Hainan Branch of CNOOC China Ltd.,Haikou 570312)
出处
《地质科学》
CAS
CSCD
北大核心
2024年第5期1268-1279,共12页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
中国海洋石油有限公司科研项目“琼东南盆地梅山组有效浊积储集体主控因素及储层预测技术”(编号:YXKY-ZX 032021)资助。
关键词
浊积扇
沉积构成
沟道
朵叶
储层差异
梅山组
Turbidite fan
Sedimentary composition
Channel lobe
Reservoir differences
Meishan Formation
