Comprehensive Evaluation Of Logging Of Tight Oil Reservoirs In The Da'anzhai Section Of The Jurassic In The Chuanzhong Oilfield

According to previous research results show that the central Sichuan basin have very rich oil and gas resources,Dan'an zhai and Liang'gaoshan hydrocarbon resources will reach more than 1 billion tons, which fully reflects the upper Jurassic in tight oil siltstones at present there are still a large exploration and development potential. At present, the upper oilfield facing the serious situation of crude oil and stable development is difficult, in order to ensure the production stable production, need favorable explore new blocks. This requires that the geological understanding through in-depth for upper field next tight oil exploration and development provide reliable geological understanding well placement.This paper by sedimentary petrography, reservoir geology, logging geology, geophysical well logging, and the latest research progress both at home and abroad as the theoretical guidance, core flakes, geological and logging data as the main research object, the combination of macro and micro analysis, well logging technology and the combination of geology research methods, combining previous research results, the top in the middle region of the Sichuan oilfield walled section of tight oil formation lithology, physical property, electric property and oiliness, cracks, organic carbon content (TOC), reservoir characteristics and control factors into the in-depth study.In this paper, the Sichuan area Da'anzhai well drilling, logging, well logging and well testing data oil, production, and so on, in the areas of existing research results foundation, to carry out the Da'anzhai formation and storage layer of relationship analysis, crack analysis, hydrocarbon source condition analysis. The study found that the Da'anzhai member source rock and reservoir of various primary reservoirs, Da'anzhai period developed a large area of shell limestone is good reservoir lithology, reservoir heterogeneity is strong, poor physical property and compact, with the macro characteristics of oil-bearing area, the development of cracks for reservoir productivity provide a contribution. Hydrocarbon source rocks in the central Sichuan Basin are between 1% and 2%, with high maturity and great potential for oil and gas exploration in the future.