DIAGENETIC ENVIRONMENT AND OIL AND GAS ACCUMULATION PERIOD OF LIANGLITAGE FORMATION IN THE SOUTH AREAS OF TAHE OILFIELD OF THE TARIM BASIN
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摘要: 塔河南地区上奥陶统良里塔克组主要是一套碳酸盐岩,通过对该组岩心、薄片观察发现,其依次经历了大气渗流、混合带、浅埋藏、表生岩溶、构造后浅埋藏、深埋藏成岩环境的改造.分别研究各环境下的流体包裹体,发现在浅埋藏、深埋藏及成岩晚期有3期油气活动.结合沉积相、泥浆漏失统计、岩溶现象、储层物性、产出油气数据等资料,认为塔河南地区良里塔格组储层以岩溶孔洞为主,具有一定的勘探开发潜能.Abstract: Lianglitage Formation of the Upper Ordovician in the south areas of Tahe Oilfield of the Tarim Basin was consisted of a set of carbonates.By means of study of bore cores and thin sections observation,it indicated that the carbonates of Lianglitage Formation were experienced meteoric vadose zone,mixing-water diagenetic environment,karst,shallow and deep buried diagenetic environment.Study of the fluid inclusions showed that there were three times of oil activity in shallow,deep buried diagenetic period and late diagenetic period.With data of sedimentary facies,slurry leaking,karst,reservoir porosity and permeability,oil and gas output,it was concluded that Lianglitage Formation possessed potential for hydrocarbon exploration and development.
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Key words:
- fluid inclusion /
- diagenesis /
- diagenetic environment /
- oil and gas accumulation period /
- Ordovician /
- Tahe Oilfield /
- the Tarim Basin
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