Predicating method for high-gamma sandstones in source rocks

A technology of gamma sandstone and prediction method, applied in the field of tight oil exploration, achieves huge economic benefits, easy promotion and use, and simple operation

Inactive Publication Date: 2015-06-10
NORTHWEST UNIV(CN)
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  • Claims
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  • Predicating method for high-gamma sandstones in source rocks
  • Predicating method for high-gamma sandstones in source rocks
  • Predicating method for high-gamma sandstones in source rocks

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[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments thereof. The schematic embodiments and descriptions of the present invention are used to explain the present invention, but not as a limitation to the present invention.

[0026] The Heshui area in eastern Longdong is located in the southern part of the Yishan slope structural belt in the Ordos Basin. The source rocks of the Upper Triassic Yanchang Formation in this area are mainly developed in the Chang 7 member. According to the sedimentary cycle, the Chang 7 Member in this area is divided into Chang 7 from top to bottom. 1 , long 7 2 and long 7 3 Three sand formations, of which 7 3 During the sedimentation period of the sand formation, the lake basin area was the largest, and it was the most important development period of large-scale high-quality mature source rocks.

[0027] Longdong Heshui District Chang 7 3 The sedimentary environment o...

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Abstract

The invention discloses a predicating method for high-gamma sandstones in source rocks. The predicating method comprises the following steps: firstly, determining an average natural-gamma logging lower limit value and siltstones of the source rocks and an average natural-gamma logging upper limit value of sandstones, drawing up a radioactive contour map of the source rocks on a plane, and identifying an area with relatively high radioactive value and an area with a relatively low radioactive value; drawing up a sand thickness contour map on the plane according to the sand rock thickness identified by normal logging in the area with the relatively high radioactive value and the area with the relatively low radioactive value; predicating high-gamma sandstones in the area with the relatively high radioactive value according to the sand body formation causes and a distribution pattern on the plane. The predicating method is simple to operate, easy to popularize and use, great in economic benefit, and capable of quickly and effectively predicating a compact oil favorable area.

Description

technical field [0001] The invention relates to the technical field of tight oil exploration, in particular to a method for predicting high gamma sandstone in source rocks. Background technique [0002] The development of tight oil took the lead in the Bakken Formation (Bakken) in the Williston Basin of the United States, leading to a substantial increase in the production of such reservoirs. The U.S. EIA (2012) defines tight oil as "oil extracted from shale or other low-permeability reservoirs by using horizontal drilling and multi-stage hydraulic fracturing techniques." On this basis, Chinese scholar Jia Chengzao et al. (2012) believed that "tight oil mainly refers to the oil resources accumulated in reservoirs such as tight sandstones that are interbedded with oil-generating rocks or closely adjacent to them." Zou Cai et al. (2013) believed that the source-reservoir relationship is symbiotic, mainly including source-reservoir integrated type and source-reservoir contact ...

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Application Information

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IPC IPC(8): G01V5/12G06F19/00
Inventor 柳益群郑庆华刘行军
Owner NORTHWEST UNIV(CN)
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