The kaolinite cementation and reservoir assessment of the Upper Triassic Chang-2 pay set in the Jiyuan region,Shaanxi
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摘要: 姬塬地区长2油层组次生孔隙在储层砂岩的孔隙构成中比值偏大,成岩作用对储集空间的发育具有明显的控制优势。同时,该区长2油层组高岭石分布是鄂尔多斯盆地中南部较为集中且相对偏高的地区,显示出姬塬地区长2油层组在大气水作用、次生孔隙发育等方面具有特殊性。通过对该区高岭石胶结物含量和分布特征的研究,综合考虑储层物性的平面变化特征、沉积相带、构造高点等影响因素,对有利的储层区块提出了建议。Abstract: The secondary pores accounts for a greater proportion almost 50% of reservoir sandstones in the Chang-2 pay set in the Jiyuan region.The diagenesis may exercise a major control on the development of oil reservoir spaces.The concentration of kaolinite in the Jiyuan region in the south-central part of the Ordos Basin implies that stronger meteoric water action resulted in the dissolution of aluminosilicates and cementation of kaolinite in the Jiyuan region than in the other parts of northern Shaanxi.The integration of the content and distribution of kaolinite,sedimentary facies belts and structural highs led us to delineate eight relative favourable areas for further assessment of hydrocarbon accumulation in the Jiyuan region.
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Keywords:
- Jiyuan region /
- Upper Triassic /
- Chang-2 pay set /
- kaolinite cementation /
- reservoir assessment /
- (Ordos)Basin
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