-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 IzExyCpGf0WkZOK4oPxcOL0TRLi0f4WsdXFY7p91iYog2n4JTGRGfTGVFw2R0+JR
 UYtt4zAclG3xzWvZ/39Tbg==

<SEC-DOCUMENT>0001140361-10-014798.txt : 20100401
<SEC-HEADER>0001140361-10-014798.hdr.sgml : 20100401
<ACCEPTANCE-DATETIME>20100401160722
ACCESSION NUMBER:		0001140361-10-014798
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100325
FILED AS OF DATE:		20100401
DATE AS OF CHANGE:		20100401

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ION GEOPHYSICAL CORP
		CENTRAL INDEX KEY:			0000866609
		STANDARD INDUSTRIAL CLASSIFICATION:	OIL AND GAS FIELD EXPLORATION SERVICES [1382]
		IRS NUMBER:				222286646
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2105 CITYWEST BLVD
		STREET 2:		SUITE 400
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			770422839
		BUSINESS PHONE:		281.933.3339

	MAIL ADDRESS:	
		STREET 1:		2105 CITYWEST BLVD
		STREET 2:		SUITE 400
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			770422839

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INPUT OUTPUT INC
		DATE OF NAME CHANGE:	19930328

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BGP Inc., China National Petroleum Corp
		CENTRAL INDEX KEY:			0001488417
		STATE OF INCORPORATION:			F4
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12691
		FILM NUMBER:		10724135

	BUSINESS ADDRESS:	
		STREET 1:		P.O.BOX 11 ZHUOZHOU HEBEI P.R.CHINA
		CITY:			ZHUOZHOU
		STATE:			F4
		ZIP:			072751
		BUSINESS PHONE:		861081201850

	MAIL ADDRESS:	
		STREET 1:		P.O.BOX 11 ZHUOZHOU HEBEI P.R.CHINA
		CITY:			ZHUOZHOU
		STATE:			F4
		ZIP:			072751
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2010-03-25</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000866609</issuerCik>
        <issuerName>ION GEOPHYSICAL CORP</issuerName>
        <issuerTradingSymbol>IO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001488417</rptOwnerCik>
            <rptOwnerName>BGP Inc., China National Petroleum Corp</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P.O.BOX 11 ZHUOZHOU HEBEI P.R.CHINA</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ZHUOZHOU</rptOwnerCity>
            <rptOwnerState>F4</rptOwnerState>
            <rptOwnerZipCode>072751</rptOwnerZipCode>
            <rptOwnerStateDescription>CHINA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>23789536</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Wang Tiejun</signatureName>
        <signatureDate>2010-03-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----