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The Source, Distribution of Organic Acids in Oilfield Waters and Their Effects on Mineral Diagenesis in Tarim Basin

Cai Chunfang Mei Bowen Ma Ting Zhao Hongjing and Fang Xiaolin (Jianghan Petroleum Institute, Jingsha 434102)  
The source, distribution and effects of organic acid anions(OAA) in sedimentary basins were not systematically studied and were poorly understood in China. The paper presented 185 OAA data and 100 samples of dissolved Al, Si, Ba and other 12 elements in oilfield waters from Cambrian to Tertiary reservoirs of the Tarim basin. The above data showed that OAA of high concentration (800×10 -6 ) occurred in reservoirs deep than 4 300 m and nearby unconformities. OAA are thought to be sourced from thermal maturation of kerogen biodegradation and thermochemical sulfate reduction of crude oils, which is supported by high reservoir temperature(115℃to 139℃),abundance of dissolved H 2S in oilfield waters(600×10 -6 to 780×10 -6 ), and occurrence of tas mats. OAA may contribute 30% ̄70%, up to 92% of total alkalinity; thus it controls pH values of oilfield waters. The concentration of dissolved aluminum ranges up from 3.1 mg/L to 5.4 mg/L in oil-bearing reservoirs, and it indicates the existence of organic-complexing agents. Selected mineral equilibrium calculation from Carboniferous, Triassic and Jurassic reservoirs was carried out by computer code SOLMINEQ.88 for geochemical modeling of water-rock interaction, and showed that oligioclase is unsaturated and can be dissolved at 81℃ to 138℃ while kaolinate is over-saturated and tends to precipitate at the temperature lower than 132℃; quartz is near equilibrium; K feldspar is stable between 81℃ to 105℃. From the above, it can be concluded that oligioclase dissolution and kaolinite precipitation are the main diagenesis, and control secondary porosity. And it is consistent with the petrographic observation.
【Fund】: 国家“八·五”科技攻关研究成果
【CateGory Index】: P578.98
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