摘要
常规测井计算方法难以满足页岩气田探明储量申报对储层矿物含量解释精度的要求。基于全岩X衍射和数字岩心构建实验对下志留统龙马溪组页岩气储层矿物成分的认识,建立了简化的岩石物理体积模型,把岩石骨架近似看作由硅质矿物、碳酸盐矿物和黏土矿物组成。引入"黏土视骨架密度"参数,建立了新的储层矿物含量计算公式。采用岩心全岩X衍射、岩心物性、有机碳含量数据,建立适合研究区的黏土视骨架密度法系列计算图版。基于常规测井数据计算出有机碳含量,通过图版可求得黏土视骨架密度,进一步可求得页岩中与简化模型相对应的三类矿物含量。与传统方法对比,"黏土视骨架密度法"解释精度相对较高,且费用低廉,易于在研究区推广。
Shale gas proven reserve declaration in Fu ling Gas Field needs to calculate mineral percent with relatively high accuracy. According to core analysis, X- ray diffraction experiments and digital core technology, a simplified volume model is setup, in which rock skeleton is similarly composed of siliceous, carbonate and clay minerals. A new parameter of 'apparent skeleton density of clay' is introduced and thus a new formula is setup to calculate percent of minerals in Lower Silurian Longmaxi gas-bearing shale reservoir. According to data of core analysis including X- ray diffraction, porosity and TOC, a series of charts are setup. With common log data, TOC can be calculated firstly, then the 'apparent skeleton density of clay' can be obtained. Furtherly, the percent of major minerals suitable to the simplified model can be calculated with the formula. It is proved that this new logging calculation method is reasonable and useful with high accuracy and low cost.
出处
《海相油气地质》
CSCD
北大核心
2016年第4期67-72,共6页
Marine Origin Petroleum Geology
基金
国家科技重大专项“上扬子及滇黔桂区页岩气资源调查评价与选区”(编号:14B12XQ151001)资助
关键词
涪陵气田
页岩气储层
矿物成分
含量测定
Shale reservoir
Gas reservoir
Mineral composition
Content calculation
Fuling Gas Field
