白豹-南梁地区长4+5_1油层组储层特征及综合评价研究
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摘要
鄂尔多斯盆地白豹-南梁地区延长组长4+5油层段是重要的储集层之一,包括长4+51和长4+52。由于白豹-南梁地区长4+51油气富集规律尚未明确,亦有必要对白豹-南梁地区4+51储层开展评价。通过岩心铸体薄片、物性分析、压汞分析等资料对研究区长4+51储层特征进行了研究。结果表明,研究区岩石类型以长石砂岩和岩屑长石砂岩为主,分选性以中-好为主,磨圆度以次棱角状为主;孔隙类型主要为粒间孔、长石溶孔,孔隙空间分选性较差,喉道分布不集中;研究区整体以Ⅱ类储层分布为主。
The Chang 4+5 oil-bearing section of the Yanchang Formation in the Baibao-Nanliang area of the Ordos Basin is one of the important reservoirs,including 4+51 and 4+52.Since the oil and gas enrichment rules of the Chang 4+51 in the Baibao-Nanliang areas are not clear,it is necessary to evaluate the 4+51 reservoirs in the Baibao-Nanliang area.The characteristics of 4+51 reservoirs in the study area were studied by core casting thin sections,physical property analysis and mercury intrusion analysis.The results show that the rock types in the study area are dominated by feldspathic sandstone and lithic feldspar sandstone.The medium is mainly medium-good,and the roundness is mainly sub-angular;the pore type is mainly intergranular pores,feldspar dissolved pores,poor pore space sorting,and the throat distribution is not concentrated;The study area is dominated by the distribution of type II reservoirs.
The Chang 4+5 oil-bearing section of the Yanchang Formation in the Baibao-Nanliang area of the Ordos Basin is one of the important reservoirs,including 4+51 and 4+52.Since the oil and gas enrichment rules of the Chang 4+51 in the Baibao-Nanliang areas are not clear,it is necessary to evaluate the 4+51 reservoirs in the Baibao-Nanliang area.The characteristics of 4+51 reservoirs in the study area were studied by core casting thin sections,physical property analysis and mercury intrusion analysis.The results show that the rock types in the study area are dominated by feldspathic sandstone and lithic feldspar sandstone.The medium is mainly medium-good,and the roundness is mainly sub-angular;the pore type is mainly intergranular pores,feldspar dissolved pores,poor pore space sorting,and the throat distribution is not concentrated;The study area is dominated by the distribution of type II reservoirs.
引文
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[3]长庆油田石油地质志编写组.中国石油地质志(卷十二)[M].
[4]赵澄林,胡爱梅,陈碧珏,等.中华人民共和国石油天然气行业标准.SY/T6285-1997.油气储层评价方法[S].北京:石油工业出版社,1998:16.