沉积学报2012，Vol.30Issue(6)：1115-1122,8.
马朗凹陷芦草沟组源岩油储集空间特征及其成因
The Reservoir Space Characteristics and Origins of Lucaogou Formation Source Rock Oil in the Malang Sag
摘要
Abstract
The lithology of source rock oil reservoir of Lucaogou Formation in Malang sag is diverse and it mainly has mudstone, carbonatite, the transition lithology between carbonatite and mudstone, tuffaceous mud and small amounts of micrite, dolomicrite, tuff and so on. It is characterized by the lamina structure and the thickness of the lamina is 0. 1 - 10 mm. Based on the foundation of the observation of rock cores and cast slice, the macro and micro characteris- tics of the reservoir of Lucaogou Formation source rock oil in the Malang sag are studied in this paper combining with many methods of experimental analysis, such as Ar-iron polishing, scanning electronic microscopy(SEM) in the field emission environment, electron backscattering diffraction, X-ray energy spectrum, X-ray diffraction, petrographic mi- croscope, fluorescent light, and so on. The reservoir space of Lucaogou Formation source rock oil can be divided into five basic types--primary pores, secondary dissolution pores, organic hydrocarbon generating residual pores, cracks and fractures between layers of lamina and so on. Primary pores include intergranular pores which mainly exist be- tween rigid particles and intercrystal pores which exist mainly between quartz crystals and carbonate mineral crystals. Mainly secondary pores are intergranular and intragranular dissolved pores, dissolution fractures as well as caverns in the matrix. Secondary pores formed by the dissolution of the the iron calcite in shale rock samples can be seen in the scanning electron microscopy (SEM). Dissolution fractures are formed by the all or part of dissolution of the fractures in acid fluid which are already filled with calcite first. Matrix type dissolution pores are mainly formed by the dissolu- tion of unstable minerals in the matrix of the fine grain scattered rocks, which are commonly developed and scattered distributed. After the argon polishing rock surface, nm to micron grade dissolution holes can be seen in the scanning electron microscopy. This kind of pores mainly develops in calcareous mudstone, argillaceous limestone, dolomitic mudstone and mudstone. Pores formed by the thermal evolution of organic matter, called organic matter pores, com- bon generation pores play an important part in the hydrocarbon source rock reservoir space. The linear density of cracks of source rock oil reservoir of Lucaogou Formation in Malang sag could reach a hundred per meter and are most- ly vertical cracks, followed by horizontal crack and high angle oblique crack. The development of the cracks is influ- enced by brittle mineral content, bed thickness and so on. The survey region is rich in lamina. The slippage between layers and broken cracks in laminite formed the important basis of reservoir space. As a high-quality hydrocarbon source rocks, the hydrocarbon generated in laminite can concentrate in reservoir space after an extremely short of pri- mary migration, which is beneficial to the concentration of oil source rocks. Large mounts of nanometer to micron level micro pores and micro cracks develop in the source rock oil reservoir of Lucaogou Formation and their sizes are basi- cally bigger than the diameter of liquid hydrocarbon molecules, so they could form effective reservoir space.关键词
非常规油气/源岩油/储层/芦草沟组/马朗凹陷Key words
unconventional hydrocarbons/source rock oil/reservoir/Lucaogou Formation/Malang sag分类
能源科技引用本文复制引用
黄志龙,郭小波,柳波,张代生,张建波,齐永安,王瑞..马朗凹陷芦草沟组源岩油储集空间特征及其成因[J].沉积学报,2012,30(6):1115-1122,8.基金项目
国家自然科学基金项目“湖相富有机质泥页岩自生石英形成及其页岩油地质意义”（批准号：41272156）和全国油气资源战略选区调查与评价“全国页岩气资源潜力调查评价及有利区优选”项目（编号2009GYXQ15-09-00）资助. （）
