A new method for recovering paleoporosity of sandstone: case study of middle Es3 member of Paleogene formation in Niuzhuang Sag, Dongying Depression, Bohai Bay Basin in China

doi:10.1007/s11707-015-0493-8

Front. Earth Sci.

2015, Vol. 9

Issue (3) : 521-530 https://doi.org/10.1007/s11707-015-0493-8

RESEARCH ARTICLE

A new method for recovering paleoporosity of sandstone: case study of middle Es3 member of Paleogene formation in Niuzhuang Sag, Dongying Depression, Bohai Bay Basin in China

Mingjie LIU^1,^*(

),Zhen LIU²,Biao WANG³,Xiaoming SUN²,Jigang GUO⁴

1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
3. The Huabei Oilfield Company of PetroChina, Cangzhou 061023, China
4. Strategic Research Center of Oil and Gas Resources, Ministry of Land and Resources, Beijing 100034, China

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Abstract

This paper presents a new method for recovering paleoporosity of sandstone reservoirs and quantitatively defines the evolution process of porosity. This method is based on the principle that the present is the key to the past. We take the middle Es3 member in Niuzhuang Sag, Dongying Depression, and Bohai Bay Basin as an example. The method used in this study considers the present porosity as a constraint condition, and the influences of both constructive diagenesis and destructive diagenesis to divide the porosity evolution process into two independent processes, namely porosity increase and porosity decrease. An evolution model of sandstone porosity can be established by combining both the pore increase and pore decrease effects. Our study reveals that the porosity decrease model is a continuous function of burial depth and burial time, whereas the porosity increase model mainly occurs in an acidified window for paleotemperature of 70°C to 90°C. The porosity evolution process can be divided into the following phases: normal compaction, acidification and pore increase, and post-acidification compaction. Thus, the porosity evolution model becomes a piecewise function of three subsections. Examples show that the method can be applied effectively in recovering the paleoporosity of sandstone reservoirs and simulating the porosity evolution process.

Keywords paleoporosity binary function acidified window Niuzhuang Sag Bohai Bay Basin

Corresponding Author(s): Mingjie LIU

Just Accepted Date: 28 January 2015 Online First Date: 11 March 2015 Issue Date: 20 July 2015

Cite this article:

Jigang GUO,Mingjie LIU,Zhen LIU, et al. A new method for recovering paleoporosity of sandstone: case study of middle Es3 member of Paleogene formation in Niuzhuang Sag, Dongying Depression, Bohai Bay Basin in China[J]. Front. Earth Sci., 2015, 9(3): 521-530.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-015-0493-8
https://academic.hep.com.cn/fesci/EN/Y2015/V9/I3/521

Fig.1 (a) Location map showing the six major subbasins of the Bohai Bay Basin. (b) Map inset showing the oil field distribution, the locations of sections DE and FG, wells, and the normal faults for the top of the Es3 layer in the study area. (c) Cross section DE showing the different tectonic-structural zones and key stratigraphic intervals.

Fig.2 Schematic of the Cenozoic-Quaternary stratigraphy of the Niuzhuang Sag showing the tectonic evolution stages and the major petroleum system elements.

Fig.3 The model of porosity evolution is a combination of a decreasing pores model and an increasing pores model.

Fig.4 Porosity sections of typical wells in the Niuzhuang Sag showing that the trend of decreasing pores is consistent between shallow layers and deep layers.

Fig.5 The burial historian and thermal historian map of well N6 in Niuzhuang Sag showing that the temperature of the Middle Es3 member is about 90°C when the oil charging.

Fig.6 The simulation of sandstone porosity evolution of well N117 from time (a), depth(b), and synthetic evolution (c) respectively.

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