The Comparative Study of Natural Gas Accumulation Characteristics#br#
Between Puguang and Yuanba Reef-bank Gas Field

doi:10.11885/j.issn.1674-5086.2015.06.17.11

Abstract

Abstract:

Systematic correlation between the Puguang and Yuanba Gas Fields can guide the natural gas prospecting in adjacent
area and reef-bank oil-gas field in other basin. Using the chemical and isotopic composition of natural gases，thin sections，
porosity data，and geophysical data，the systematic contrastive research of the origin and resource of nature gas，the scale and
property of reservoir，the trap type and process of migration-accumulation，the tectonic deformation and preservation condition
between Puguang and Yuanba gas field are summarized. The gas reservoir characters are reflected in four aspects. The difference
in carbon isotopic composition of natural gas is related to the thermal evolution and hydrocarbon precursor types of the source
rock. The scale of source rock and hydrocarbon potential of Puguang Gas Field is better than Yuanba. The main reservoir
of Puguang Gas Field is the oolitic beach dolomite of Feixianguan Formation. In contrast，the reef and the backreef beach
dolomite of Changxing Formation is the primary reservoir type of Yuanba. The gas reservoir type of Puguang is structurallithologic
reservoir，however，Yuanba is lithologic gas reservoir，with a relatively weak adjustment and reconstruction in the
late stage than Puguang. Because of the superposition of multi-phase tectonic movement，fault-fracture system is relatively
developed in both Puguang and Yuanba gas field，but regional giant halite cap rock makes most of the gas reserved. The central
position of source rock kitchen and sufficient oil-cracking gas，and unbroken halite cap rock are the key to the formation of the
two gas fields.

Key words: Puguang Gas Field, Yuanba Gas Field, natural gas, accumulation characteristics, comparison

CLC Number:

TE132

DUAN Jinbao*. The Comparative Study of Natural Gas Accumulation Characteristics#br# Between Puguang and Yuanba Reef-bank Gas Field[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.06.17.11.

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The Comparative Study of Natural Gas Accumulation Characteristics#br# Between Puguang and Yuanba Reef-bank Gas Field

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