Lower Limits of Physical Properties of Sandstone Reservoirs in the Second Member of Sangonghe Formation in Moxizhuang Oilfield

doi:10.7657/XJPG20200507

Abstract

Abstract:

The second member of Sangonghe formation in Moxizhuang oilfield presents the characteristics of low porosity, low permeability and strong heterogeneity. Based on the data of conventional core analysis, mercury injection and formation test, the paper compares the application effects of commonly-used methods to determine the lower limits of physical properties of effective reservoirs in the study area, determines the lower limits of reservoir physical properties in the second member of Sangonghe formation, and analyzes the main factors influencing the lower limits of reservoir physical properties. The results show that the second member of Sangonghe formation in Moxizhuang oilfield is mainly composed of medium-fine sandstone deposited in delta front, the reservoir space of the formation is dominated by primary intergranular pores, and the methods of starting pressure gradient, the distribution function curve and oil-bearing occurrence are very practical for determining the lower limits of reservoir physical properties in the study area, and the lower limits of reservoir porosity and permeability are determined as 10.1% and 1.15 mD, respectively. Sedimentary facies and diagenesis are the main factors affecting the lower limits of reservoir physical properties. Strong dissolution, weak compaction and weak cementation reservoirs of underwater distributary channel microfacies have the lowest limits of physical properties. In addition, crude oil properties and reservoir burial depth are the minor factors affecting the lower limits of reservoir physical properties.

Key words: Moxizhuang oilfield, Sangonghe formation, low porosity and low permeability, effective reservoir, starting pressure gradient method, distribution function curve method, oil-bearing occurrence method, lower limit of reservoir physical property

CLC Number:

TE112.23

MENG Lei. Lower Limits of Physical Properties of Sandstone Reservoirs in the Second Member of Sangonghe Formation in Moxizhuang Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(5): 557-564.

Figures/Tables 11

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物性下限确定方法	代表性方法	使用资料	前人研究实例	适用性
基于岩心分析的物性下限确定方法	孔渗交会法	孔隙度、渗透率	新疆油田某区块储集层^[12]：孔隙度下限为7.0%,渗透率下限为1.00 mD	应用全区的岩心分析数据,但趋势线类型和拐点的确定受人为因素干扰大
	储集层品质指数法	孔隙度、渗透率	新疆油田某区块储集层^[12]：孔隙度下限为7.0%	应用全区的岩心分析数据,但趋势线类型和拐点的确定受人为因素干扰大
	启动压力梯度法	孔隙度、渗透率、压汞资料		从渗流角度出发,较有说服力
基于测试分析的物性下限确定方法	分布函数曲线法	孔隙度、渗透率、试油结果	东营凹陷西部沙四上亚段滩坝砂储集层（埋深3 400~3 600 m）^[9]：孔隙度下限为11.1%,渗透率下限为1.29 mD	试油结果中干层数量少,无法代表非有效储集层
	正逆累积法	孔隙度、渗透率、试油结果	中东地区Z油田孔隙型碳酸盐岩储集层^[14]：孔隙度下限为6.2%,渗透率下限为0.45 mD	试油结果中干层数量少,无法代表非有效储集层
	试油法	孔隙度、渗透率、试油结果	永进油田西山窑组储集层^[15]：孔隙度下限为6.5%,渗透率下限为0.07 mD	试油资料少,确定的物性下限精度较低
	含油产状法	孔隙度、渗透率、试油结果、岩心含油级别	塔里木盆地迪北气藏阿合组致密砂岩储集层^[16]：孔隙度下限为2.0%,渗透率下限为0.03 mD	试油资料少,但结合了岩心含油产状资料,应用性较好