鄂尔多斯盆地庆阳以南三叠系延长组长_5、长_6、长_7储层成岩作用  

DIAGENESES OF THE RESERVOIRS CHANG 5,CHANG 6 AND CHANG 7 OF YANCHANG FORMATION OF TRIASSIC TO THE SOUTH OF QINGYANG IN EERDUOSI BASIN

作　　者：牟泽辉[1] 

机构地区：[1]中石化石油勘探开发研究院荆州新区勘探研究所

出　　处：《天然气工业》2001年第2期13-17,共5页Natural Gas Industry

基　　金：中石化新星石油公司研究项目!<鄂尔多斯盆地南部油气勘探靶区选择>部分成果

摘　　要：三叠系延长组长5、长6、长7为区内主要油气勘探目的层 ,它们的储层主要经历了溶蚀作用、白云石化作用、破裂作用、沸石化作用、压实作用和胶结作用等一系列成岩作用 ,成岩作用复杂 ,成岩现象十分丰富 ,且特征明显。成岩作用研究表明 ,溶蚀作用、白云石化作用、破裂作用、沸石化作用是有利于区内孔隙发育的成岩作用 ,而压实作用和胶结作用则是使储层物性变差、孔隙度降低的两个重要成岩作用。可将延长组储层分为持续埋藏型成岩系统和中间开启型成岩系统 ,区内井深 130 0～ 15 0 0m和 170 0～ 190 0m为次生孔隙发育段 ,且物性条件和孔隙结构受控于沉积环境和成岩作用。The Reservoirs Chang-5, Chang-6 and Chang-7 of Yanchang Formation, Triassic, are the major oil and gas exploration target zones in the region. They were suffered a series of complex, abundant and obvious diageneses, such as corrosion, dolomitization, fragmentation zeolotization, compaction and cementation etc. Through research it is shown that the first four diageneses are beneficial to the growth of pores in this region, but the last two ones can cause the petrophysical property to be disadvantaged and the porosity to be declined. The Yanchang Formation reservoirs may be divided into a continuously buried diagenetic system and a medium opening diagenetic system. In this region, the well depths of 1 300 - 1 500 m and 1 700-1 900 m are the secondary pore growth intervals and the petrophysical condition and pore structure are controlled by sedimentary environment and diageneses.

关 键 词：延长组 鄂尔多斯盆地 成岩作用 成岩模式 储层 油气藏 

分 类 号：P618.13[天文地球—矿床学]