Abstract:

After the adjustive development plan implemented in the S Region of LF-Y oilfield, some drilling data have displayed that the structural west frank became deeper and the oil-bearing area became smaller.  The static OIP recalculated in the S Region was 1,328.30 ×10⁴ m³, which did not match with field production performance. Some methods were used to analysis OIP and its rationality, which included the dynamic method of production, inversion calculation methods, and numerical reservoir simulation method. Then a question that the geologic OIP displayed insufficient was brought forward, after detailed analysis. The OIP by inversion calculation was in the range of 1,450.00×10⁴ m³to 1,700.00×10⁴ m³, and unidentified remaining likely potential for reserves is in west frank. Some studies were put forward, which contained porosity inversion, detailed geological modeling, reserve calculation, and numerical reservoir simulation, and the result of geologic reserve was 1,566.03×10⁴ m³ in the S Region, increased by 237.73 ×10⁴ m³. So the contradiction of reserve insufficient in S region was solved by static and dynamic analyses. The problem that reserve displayed insufficient in the S region was resolved and the updated geologic simulation model was more harmoniously interactive. The prediction of remaining oil distribution is more reliable and it provides also geologic reserve evidences to guarantee the successful adjustive oilfield development plan (ODP). Meanwhile, it verified the function of oilfield production performance feeding back into the hydrocarbon reserves and it also provided a method to resolve difficult geologic problem by integrated dynamic and static data.

Key words: geologic OIP, geological model, numerical reservoir simulation, porosity inversion, oilfield development plan