The Identification And Evaluation Of Excellent Source Rockin Tanan Sag And Nanbeier Sag

The eastern belt of transition first belt which area is3.5km2has geological reserves of15359000tons. This area was developed by two layer systems-basic system and encryptssystem. There are8oil groups of51layers. Currently basic well pattern has16water wellsand37oil wells; encrypts well pattern has45water wells and44oil wells, so there are total of142walls. After40years development by water injection, because the single well drilled lessoil layers, especially after infilling adjustment, residual oil has the characteristics of worsenature, plane distribution is very uneven, highly decentralized longitudinal. After years ofwater flooding development and adjustment, flat contradiction and different layerscontradiction are very prominent, so the development effect is poor. In order to improve thedevelopment effect, it is necessary to carry out fine geologic comprehensive evaluation todetermine the remaining oil distribution and its main controlling factors; carry out layerscomplementary test and adaptive research. Rational use existing well pattern to undertakelayers encryption and reset, so as to improve the development effect.This paper presents an adjusted thought for the development of the transition belt, i.e.through complementary between basic well pattern and encrypts well pattern to narrow thedistance among wells, perfect narrow sand body of injection-production relationship, improvethe development effect of water flooding in transition belt. After two years of scientificresearch, we opened up layers complementary research area and summed up the layerscomplementary technical limit and water injection adjustment method. Then we researchedthe change rules,and summed up the method of transition belt layers complementary. Wepromoted this method and carried it out, and good results were obtained.