Characteristics of tight oil (gas) reservoir and logging evaluation method

It is characterized by high pressure, high strength and high hardness, and the evaluation methods include pressure measurement and electrical measurement.

The main features of 1. tight reservoir include: high pressure. Because of the small reservoir pores and high pressure; High strength and hardness. Due to the small grain size of the reservoir and the large matrix contact area between rock units, the tight reservoir has the characteristics of high strength and hardness. Low porosity and permeability. The composition and structure of rocks lead to relatively low porosity and permeability of reservoirs.

2. Logging evaluation methods mainly include: pressure measurement. The pressure measurement method mainly uses the shell pressure gauge and pore pressure gauge in logging tools, and estimates the reservoir pressure and permeability by synchronous measurement and well pressure analysis. Electrical measurement method. Electrical logging method can directly measure physical parameters such as porosity, water content, salinity and shale content of reservoirs, so as to judge the storage capacity and production status of reservoirs. Nuclear magnetic resonance logging method. Nuclear magnetic resonance vibration logging method can measure reservoir porosity, liquid content, mobile liquid content and other parameters, so as to evaluate reservoir productivity, oil-water distribution and so on.