Organization

School of Earth Sciences and Engineering, Xi′an Shiyou University, Xi′an 710065, China Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi′an 710065, China Fuxian Oil Production Plant, Shaanxi Yanchang Oilfield Co., LTD., Yan′an 716000, China College of Geosciences, China University of Petroleum, Beijing 102249, China Pudong Oil Production Plant, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China

摘要

文中综合应用铸体薄片、扫描电镜、压汞、核磁共振等分析化验及测井技术，研究了蒿巴寺地区长6段致密砂岩储层孔喉特征及成岩作用。研究结果表明：长6段储层孔隙类型以残余粒间孔和溶蚀孔隙为主，孔喉半径分布在0.003~100.000 μm。长6段储层孔喉分为3类，即Ⅰ类孔喉为小孔￣细喉、微细喉型，以微米级粒间孔和较大的溶蚀孔为主，油气显示为油斑级以上；Ⅱ类孔喉为小孔￣微喉型，以较大的黏土晶间孔和溶蚀孔为主，油气显示为油迹级；Ⅲ类孔喉为细孔、微孔￣微喉型，以纳米级晶间孔为主，油气显示为荧光或不含油。压实作用减小孔隙度21.1%，是造成储层物性变差的主因，胶结作用减小孔隙度9.6%，而溶蚀作用增加孔隙度2.0%，可在一定程度上改善储层物性。

Abstract

The pore-throat characteristics and diagenesis of Chang 6 Member tight sandstone reservoir in Haobasi area were studied by chemistry analysis and logging techniques, such as cast sheet, scanning electron microscope, mercury injection and nuclear magnetic resonance test, etc. The results show that the pore types of Chang 6 reservoir are mainly residual intergranular pores and dissolution pores, and the radius of pore throats are distributed in 0.003￣100.000 μm; the pore throats of Chang 6 reservoir are divided into three categories: class I pore throats are small pore-micro throat and micro throat, mainly micro-sized intergranular pores and the oil and gas shows of above the oil spot level; class Ⅱ pore throats are small pores-micro throat type, with main large clay micropores and dissolution pores, and oil and gas shows of oil stain level; type Ⅲ pore throats are fine hole, micro pore-micro throat type, with nanometer-scale intergranula pores as the main, and oil and gas shows of fluorescence or no oil; the compaction effect reduces the porosity by 21.1%, which is the main cause of the deterioration of reservoir physical properties, the cementation reduces the porosity by 9.6%, and the dissolution increases the porosity by 2.0%, which can improve the reservoir properties to some extent.

关键词：

致密储层; 孔喉特征; 成岩作用; 长6段; 蒿巴寺
;

Keywords:

tight reservoir; pore-throat characteristics; diagenesis; Chang 6 Member; Haobasi
;

基金项目

DOI

10.6056/dkyqt201906005

蒿巴寺地区长6段致密储层孔喉特征及成岩作用