Fluid Evaluation of Light Oil-Gas Accumulations with Gas Logging in Bohai Oilfield
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摘要:
渤海油田中深层轻质油气流富集，原油密度小，气油比高，普遍处于气液同存的的交错相态。由于轻质油、气层荧光、气测等录井特征相似，加之部分井眼条件差，测井资料不完善，造成流体识别难度大。对目前常用的气测录井系统开展轻质油气藏流体性质评价研究发现，基于常规气测组分(C1—C5)的3H组合模型呈现一定的规律性，但与传统解释模型存在差异，结合星型图流体相分析法，可有效识别渤海油田PL7区块凝析气与轻质油，流体界面明显。对于FLAIR气测录井系统，针对测量组分(C1—C8)引入能够敏感反映油气丰度变化的气指数、油指数和水指数3个流体指数，依据这3个流体指数的纵向组合形态和变化趋势，可准确识别油气性质，对渤海油田轻质油气藏的流体评价优势明显。该研究促进了所在区块油气分布格局和储量的落实，在其他钻遇轻质油气流的区块具有较高的推广应用价值。
Abstract:Light oil and gas are mostly accumulated in middle-deep formations in the Bohai oilfield. Owing to the low density and high gas/oil ratio of the crude oil, gas coexists with oil. Light oil usually has similar mud logging curves with gas layers. In addition to it, logging data are deficient in some of the wells because of bad borehole conditions. These lead to the difficulties in fluid identification. Therefore, research for light fluid evaluation has been taken for the commonly used gas logging system. The 3H combined model based on conventional gas components (C1-C5) shows certain regular pattern which is quite different from traditional 3H model. Condensate gas and light oil as well as the interface of them are effectively recognized by the combination of 3H model and star charts, which are used to identify the fluid phase. Three fluid indexes based on C1-C8 detected by FLAIR system can sensitively reflect the abundance of hydrocarbon. They have obvious advantages in fluid evaluation of light oil-gas reservoir in the Bohai oilfield. The research promotes the recognition of oil and gas distribution pattern and reserve confirmation of the structural belt and is valuable for further application to other light oil-gas zones.
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Key words:
- light oil-gas reservoir /
- conventional gas logging /
- 3H interpretation model /
- star chart /
- FLAIR /
- fluid index
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表 1 Q29-Y井FLAIR气体组分特征
Table 1. Flair gas components characteristics of Q29-Y
层号 FLAIR气测组分/10-6 录井解释 试油结论 C1 C2 C3 iC4 nC4 iC5 nC5 nC6 nC7 nC8 C6H6 C7H8 C7H14 ① 74 390 7 907 2 596 384 950 312 370 89 18 8 30 20 6 气层 气层 ② 71 066 8 595 2 830 429 1 375 463 580 171 25 5 64 26 8 气层 气层 ③ 58 686 6 703 2 317 174 1511 374 475 163 51 15 66 68 21 油层 油层 
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