常规气测录井是发现油气显示，评价储层含油气性的重要方法，不同类型油气藏气测值的特征不同，通过对上述特征的总结分析可以区分油气藏类型。综合气体指数法（COGASIN，Comprehensive Gas Index），是利用C1—C5组分体积分数计算得到...常规气测录井是发现油气显示，评价储层含油气性的重要方法，不同类型油气藏气测值的特征不同，通过对上述特征的总结分析可以区分油气藏类型。综合气体指数法（COGASIN，Comprehensive Gas Index），是利用C1—C5组分体积分数计算得到评价指数，绘制指数曲线和三元图来区分油气藏类型的方法。对原生油气藏可以明晰地判断储层流体性质，结合气测录井定量参数全烃数据，可以达到解释储层性质的目的。提出了综合气体指数法的计算方法，对不同类型油气藏的综合气体指数曲线和三元图特征进行分析总结，并初步形成了基于轻烃比值指数反映油藏特征的技术方法。展开更多
The Ordovician carbonate reservoirs in the Tarim Basin with secondary dissolution pores and vugs have complicated pore structures. The weathering crust reservoirs mainly consist of large cavities or vugs connected by ...The Ordovician carbonate reservoirs in the Tarim Basin with secondary dissolution pores and vugs have complicated pore structures. The weathering crust reservoirs mainly consist of large cavities or vugs connected by fractures, but most of the reef-shoal reservoirs have complex and small throats among matrix pores. The pore structure can be divided into four types: big pore and big throat, big pore but small throat, small pore and small throat, and fracture type. Most of the average throat radius falls between 0.03 and 0.07 μm, close to that of unconventional reservoirs except in local areas with developed fractures. Fluid driving force analysis shows that the differentiation of fluid is mainly controlled by the throat radius in two kinds of mechanism separated by the critical throat radius about 0.1 μm. There is obvious fluid differentiation and oil/gas/water contact in fracture-cavity reservoirs with big throats. However, most of reservoirs under the critical throat radius have high capillary pressure, which resulted in incomplete differentiation of gas/oil/water, and complicated fluid distribution and fluid properties in the unconventional reservoirs.展开更多
文摘常规气测录井是发现油气显示，评价储层含油气性的重要方法，不同类型油气藏气测值的特征不同，通过对上述特征的总结分析可以区分油气藏类型。综合气体指数法（COGASIN，Comprehensive Gas Index），是利用C1—C5组分体积分数计算得到评价指数，绘制指数曲线和三元图来区分油气藏类型的方法。对原生油气藏可以明晰地判断储层流体性质，结合气测录井定量参数全烃数据，可以达到解释储层性质的目的。提出了综合气体指数法的计算方法，对不同类型油气藏的综合气体指数曲线和三元图特征进行分析总结，并初步形成了基于轻烃比值指数反映油藏特征的技术方法。
基金supported by the National Basic Research Program of China (973 Program,Grant No.2011CB201106)
文摘The Ordovician carbonate reservoirs in the Tarim Basin with secondary dissolution pores and vugs have complicated pore structures. The weathering crust reservoirs mainly consist of large cavities or vugs connected by fractures, but most of the reef-shoal reservoirs have complex and small throats among matrix pores. The pore structure can be divided into four types: big pore and big throat, big pore but small throat, small pore and small throat, and fracture type. Most of the average throat radius falls between 0.03 and 0.07 μm, close to that of unconventional reservoirs except in local areas with developed fractures. Fluid driving force analysis shows that the differentiation of fluid is mainly controlled by the throat radius in two kinds of mechanism separated by the critical throat radius about 0.1 μm. There is obvious fluid differentiation and oil/gas/water contact in fracture-cavity reservoirs with big throats. However, most of reservoirs under the critical throat radius have high capillary pressure, which resulted in incomplete differentiation of gas/oil/water, and complicated fluid distribution and fluid properties in the unconventional reservoirs.
